AMA Class C Approved Models 1949-1989

AMA
History
Home

MOTORCYCLES APPROVED FOR AMA CLASS C COMPETITION
1948 to 1989

NOTE: 1949 was the first year that the AMA published a list of approved models for competition.
Several models listed in the 1949 approval were approved prior to 1949.

Jump to Bottom

Year Approved	Brand / Model	Approx. Displacement	Configuration	Source	AMA Vintage National Class
NOTE: Searches do not work in combination with each other.
1955	ADLER MB	250cc	248cc 2-stroke air-cooled twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1957	ADLER Moto Cross / Moto X	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1969	1960s era 250cc
1957	ADLER Sprinter	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1970	1960s era 250cc
1949	AJS 18	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1971	1940s era 750cc
1949	AJS 16M	360cc	348cc 4-stroke overhead valve single cylinder [69mm bore x 93mm stroke]	Bulletin #61 5/15/1972	1940s era 750cc
1949	AJS 16MCS	360cc	348cc 4-stroke overhead valve single cylinder [69mm bore x 93mm stroke]	Bulletin #61 5/15/1973	1940s era 750cc
1949	AJS 16MS	360cc	348cc 4-stroke overhead valve single cylinder [69mm bore x 93mm stroke]	Bulletin #61 5/15/1974	1940s era 750cc
1949	AJS 18C	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1975	1940s era 750cc
1949	AJS 18CS	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1976	1940s era 750cc
1949	AJS 18S	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1977	1940s era 750cc
1952	AJS 20	500cc	498cc 4-stroke overhead valve twin cylinder [66mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	AJS 20B	560cc	544cc 4-stroke overhead valve twin cylinder [69mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1956	AJS 30	600cc	592cc 4-stroke overhead valve twin cylinder [72mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	AJS 18CS	500cc	497cc 4-stroke overhead valve single cylinder [86mm bore x 85.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	AJS 30CS	600cc	592cc 4-stroke overhead valve twin cylinder [72mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	AJS 14 Road Trim	250cc	246cc 4-stroke overhead valve single cylinder [70mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	AJS 14CS Scrambler	250cc	246cc 4-stroke overhead valve single cylinder [70mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	AJS 18 CST Typhoon	560cc	569cc 4-stroke overhead valve single cylinder [87.3mm bore x 95mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1958	AJS 18CS	500cc	497cc 4-stroke overhead valve single cylinder [86mm bore x 85.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1958	AJS Clubman (Model 31)	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.35mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	AJS Hurricane	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.35mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	AJS Road Trim	250cc	250cc 4-stroke overhead valve single cylinder [70mm bore x 65mm stroke]	January 1959 approvals	1960s era 250cc
1959	AJS Typhoon	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	January 1959 approvals	1960s era 750cc
1959	AJS Moto X	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	January 1959 approvals	1960s era 750cc
1959	AJS 18 TCS Typhoon	600cc	588cc 4-stroke overhead valve single cylinder [87.3mm bore x 98.2mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1959	AJS 18 TCS Typhoon	600cc	588cc 4-stroke overhead valve single cylinder [87.3mm bore x 98.2mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1959	AJS 31CS Scrambler	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.3mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	AJS CS Scrambler	250cc	250cc 4-stroke overhead valve single cylinder [70mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1971	AJS Y40	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1953	ALL-STATE 9415	125cc	121cc 2-stroke single cylinder [52.1mm bore x 56.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1953	ALL-STATE 9417 ' 200'	250cc	198cc 2-stroke air-cooled split single [2X 45mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1954	ALL-STATE 9418 ' 250'	250cc	248cc 2-stroke air-cooled split single [2X 45mm bore x 78mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1956	ALL-STATE 9416 ' 175'	175cc	170cc 2-stroke air-cooled split single [2X 41.9mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1956	ALL-STATE 9417 ' 200'	250cc	198cc 2-stroke air-cooled split single [2X 45mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1956	ALL-STATE 9418 ' 250'	250cc	248cc 2-stroke air-cooled split single [2X 45mm bore x 78mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	ALL-STATE 94200	250cc	248cc 2-stroke split single [2X 45mm bore x 78mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1978	AMERICAN 750-1	750cc	748cc 4-stroke twin cylinder [80mm bore x 74.5mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1950	ARIEL 4G Square 4	1000cc	996cc 4-stroke overhead valve four cylinder [65mm bore x 75mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1950	ARIEL KG	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ARIEL KH Red Hunter	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ARIEL NG	360cc	346cc 4-stroke overhead valve single cylinder [72mm bore x 85mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ARIEL NH Red Hunter	360cc	346cc 4-stroke overhead valve single cylinder [72mm bore x 85mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ARIEL VB	600cc	598cc 4-stroke side valve single cylinder [86.4mm bore x 102mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ARIEL VG	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ARIEL VH Red Hunter	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1953	ARIEL KH	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1953	ARIEL KHA	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1953	ARIEL VCH Competition	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1953	ARIEL VH	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1953	ARIEL VHA	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	ARIEL FH	650cc	646cc 4-stroke overhead valve twin cylinder [70mm bore x 84mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1954	ARIEL HS Red Hunter Scrambler	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	ARIEL HT Red Hunter Scrambler	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	ARIEL LH Colt	250cc	198cc 4-stroke overhead valve single cylinder [60mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	ARIEL HT Speedway	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1958	ARIEL FH	650cc	646cc 4-stroke overhead valve twin cylinder [70mm bore x 84mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	ARIEL Leader	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	ARIEL Colt	250cc	198cc 4-stroke overhead valve single cylinder [60mm bore x 70mm stroke]	January 1959 approvals	1960s era 250cc
1959	ARIEL HTS	350cc	346cc 4-stroke overhead valve single cylinder [72mm bore x 85mm stroke]	January 1959 approvals	1960s era 750cc
1959	ARIEL HTS	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	January 1959 approvals	1960s era 750cc
1959	ARIEL HS	500cc	499cc 4-stroke overhead valve single cylinder [81.8mm bore x 95mm stroke]	January 1959 approvals	1960s era 750cc
1961	ARIEL Arrow	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1985	ATK ATK 560	560cc	562cc 4-stroke single cylinder [94mm bore x 81mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1965	BENELLI Barracuda	250cc	245cc 4-stroke overhead valve single cylinder [74mm bore x 57mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	BENELLI Imperial	125cc	124cc 4-stroke overhead valve single cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	BENELLI Sprite	250cc	198cc 4-stroke overhead valve single cylinder [66.5mm bore x 57mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1970	BENELLI 650 Tornado	660cc	658cc 4-stroke twin cylinder [85mm bore x 58mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	BENELLI 175cc Enduro	175cc	170cc 2-stroke single cylinder [60mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	BENELLI Banshee	100cc	88cc 2-stroke single cylinder [51mm bore x 43mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	BENELLI Panther	125cc	121cc 2-stroke single cylinder [56mm bore x 49mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1974	BENELLI Phantom	250cc	232cc 2-stroke air-cooled twin cylinder [56mm bore x 47mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1974	BENELLI SEI	750cc	750cc 4-stroke air-cooled overhead cam six cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1975	BENELLI Quattro	500cc	500cc 4-stroke air-cooled overhead cam four cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1964	BIANCHI Guardian	80cc	71cc 2-stroke single cylinder [46mm bore x 43mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1951	BMW R51-3	500cc	494cc 4-stroke overhead valve twin cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1957	BMW R50	500cc	494cc 4-stroke overhead valve twin cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	BMW R60/5	500cc	494cc 4-stroke overhead valve twin cylinder [68mm bore x 68mm stroke]	Bulletin #61 10/2/1973	1960s era 750cc
1960	BMW R26	250cc	247cc 4-stroke overhead valve single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	BMW R27	250cc	247cc 4-stroke overhead valve single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	BMW R50S	500cc	494cc 4-stroke overhead valve twin cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1961	BMW R69S	600cc	594cc 4-stroke overhead valve twin cylinder [72mm bore x 73mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1970	BMW R75/5	750cc	746cc 4-stroke overhead valve twin cylinder [82mm bore x 70.6mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1974	BMW R75/6	750cc	746cc 4-stroke air-cooled twin cylinder [82mm bore x 70.6mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1974	BMW R90/6	1000cc	898cc 4-stroke air-cooled twin cylinder [90mm bore x 70.6mm stroke]	Bulletin #61 9/18/1974	Hot Rod Multis
1974	BMW R90S	1000cc	898cc 4-stroke air-cooled twin cylinder [90mm bore x 70.6mm stroke]	Bulletin #61 9/18/1974	Hot Rod Multis
1977	BMW R100S	1000cc	980cc 4-stroke twin cylinder [94mm bore x 70.6mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1966	BRIDGESTONE Dual Twin "R"	175cc	176cc 2-stroke twin cylinder [49.76mm bore x 45mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	BRIDGESTONE Mountain C210	100cc	88cc 2-stroke single cylinder [50mm bore x 45mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	BRIDGESTONE Sport C301	80cc	58cc 2-stroke single cylinder [41.9mm bore x 41.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	BRIDGESTONE Sport C302	100cc	88cc 2-stroke single cylinder [50mm bore x 45mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	BRIDGESTONE Sports C300	50cc	50cc 2-stroke single cylinder [38.9mm bore x 41.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	BRIDGESTONE Trail Scr C209	100cc	88cc 2-stroke single cylinder [50mm bore x 45mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1968	BRIDGESTONE C304	100cc	99cc 2-stroke single cylinder [53mm bore x 45mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	BRIDGESTONE C306	100cc	88cc 2-stroke single cylinder [50mm bore x 45mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	BRIDGESTONE C314	100cc	99cc 2-stroke single cylinder [53mm bore x 45mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	BRIDGESTONE C315	175cc	176cc 2-stroke twin cylinder [50mm bore x 45mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	BRIDGESTONE C320	360cc	344cc 2-stroke twin cylinder [61mm bore x 59mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1969	BRIDGESTONE Sport 100	100cc	99cc 2-stroke single cylinder [53mm bore x 45mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	BRIDGESTONE Sport 200	250cc	198cc 2-stroke twin cylinder [53mm bore x 45mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1969	BRIDGESTONE Trail 100	100cc	99cc 2-stroke single cylinder [53mm bore x 45mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	BRIDGESTONE Trail 200	250cc	198cc 2-stroke twin cylinder [53mm bore x 45mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1971	BRONCCO APACHE TX9	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1954	BSA A10 Road Rocket	650cc	646cc 4-stroke overhead valve twin cylinder [70mm bore x 84mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1954	BSA A7 Shooting Star	500cc	496cc 4-stroke overhead valve twin cylinder [66mm bore x 72.6mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	BSA B32GS	360cc	348cc 4-stroke overhead valve single cylinder [71mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	BSA B33 Gold Star	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	BSA B34 Gold Star	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	BSA B34GS Gold Star	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	BSA C10L	250cc	249cc 4-stroke side valve single cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1954	BSA C11	250cc	249cc 4-stroke overhead valve single cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	BSA A10R	650cc	646cc 4-stroke overhead valve twin cylinder [70mm bore x 84mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	BSA A10RR Rocket Scrambler	650cc	646cc 4-stroke overhead valve twin cylinder [70mm bore x 84mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	BSA B32 Alloy Clipper	360cc	348cc 4-stroke overhead valve single cylinder [71mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	BSA B34 Alloy Clipper	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	BSA B34 Catalina Scrambler	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	BSA B34 Dirt Track	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	BSA D3	175cc	148cc 2-stroke single cylinder [57mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	BSA D5 Bantam Super	175cc	172cc 2-stroke single cylinder [61.5mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	BSA D5 Super Bantam	175cc	172cc 2-stroke single cylinder [61.5mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	BSA Bantam D1	125cc	123cc 2-stroke single cylinder [52mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	BSA C15 Scrambler	250cc	247cc 4-stroke overhead valve single cylinder [67mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	BSA C15 Standard	250cc	247cc 4-stroke overhead valve single cylinder [67mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	BSA D7	175cc	172cc 2-stroke single cylinder [61.5mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	BSA C12	250cc	249cc 4-stroke overhead valve single cylinder [63mm bore x 80mm stroke]	January 1959 approvals	1960s era 250cc
1959	BSA Clipper	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	January 1959 approvals	1960s era 750cc
1959	BSA Catalina	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	January 1959 approvals	1960s era 750cc
1959	BSA Gold Star	500cc	499cc 4-stroke overhead valve single cylinder [85mm bore x 88mm stroke]	January 1959 approvals	1960s era 750cc
1959	BSA Shooting Star	500cc	496cc 4-stroke overhead valve twin cylinder [66mm bore x 72.6mm stroke]	January 1959 approvals	1960s era 750cc
1959	BSA A7 Flash	500cc	496cc 4-stroke overhead valve twin cylinder [66mm bore x 72.6mm stroke]	January 1959 approvals	1960s era 750cc
1959	BSA A10 Flash	650cc	646cc 4-stroke overhead valve twin cylinder [70mm bore x 84mm stroke]	January 1959 approvals	Hot Rod Multis
1959	BSA A10 Rocket	650cc	646cc 4-stroke overhead valve twin cylinder [70mm bore x 84mm stroke]	January 1959 approvals	Hot Rod Multis
1959	BSA Dirt Track	500cc	499cc 4-stroke overhead valve twin cylinder [85mm bore x 88mm stroke]	January 1959 approvals	1960a era 750cc
1960	BSA C15 Scrambler	250cc	247cc 4-stroke overhead valve single cylinder [67mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	BSA B40	360cc	343cc 4-stroke overhead valve single cylinder [79mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1962	BSA A50	500cc	498cc 4-stroke overhead valve twin cylinder [65.5mm bore x 74mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1962	BSA A65 Royal Star	650cc	654cc 4-stroke overhead valve twin cylinder [75mm bore x 74mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1964	BSA A502C Cyclone	500cc	498cc 4-stroke overhead valve twin cylinder [65.5mm bore x 74mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1964	BSA A65-2L Lightening	650cc	654cc 4-stroke overhead valve twin cylinder [75mm bore x 74mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1964	BSA A65-2SPH Hornet	650cc	654cc 4-stroke overhead valve twin cylinder [75mm bore x 74mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1964	BSA A65-IT Thunderbolt	650cc	654cc 4-stroke overhead valve twin cylinder [75mm bore x 74mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1964	BSA Cyclone Competition	500cc	498cc 4-stroke overhead valve twin cylinder [65.5mm bore x 74mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1966	BSA Victor Scrambler	500cc	441cc 4-stroke overhead valve single cylinder [79mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1966	BSA Victor Special	500cc	441cc 4-stroke overhead valve single cylinder [79mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1967	BSA B25	250cc	247cc 4-stroke overhead valve single cylinder [67mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	BSA B25	360cc	343cc 4-stroke overhead valve single cylinder [79mm bore x 70mm stroke]	Bulletin #61 10/31/1977	1960s era 750cc
1967	BSA B25	360cc	352cc 4-stroke overhead valve single cylinder [80mm bore x 70mm stroke]	Bulletin #61 10/31/1977	1960s era 750cc
1967	BSA B25	360cc	356cc 4-stroke overhead valve single cylinder [80.5mm bore x 70mm stroke]	Bulletin #61 10/31/1977	1960s era 750cc
1969	BSA A75 / Rocket 3	750cc	741cc 4-stroke overhead valve three cylinder [67mm bore x 70mm stroke] four speed	Bulletin #61 3/1/1969	1970s era 750cc
1971	BSA A75V / Rocket 3	750cc	741cc 4-stroke overhead valve three cylinder [67mm bore x 70mm stroke] five speed	Bulletin #61 10/2/1973	1970s era 750cc
1971	BSA A70L	750cc	752cc 4-stroke overhead valve twin cylinder [75mm bore x 85mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	BSA B50SS	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1971	BSA B50T	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1972	BSA RICKMAN METISSE 250MX	250cc	248cc 4-stroke overhead valve single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1987	BUELL RR1000 B.T.	1000cc	998cc 4-stroke twin cylinder [81mm bore x 96.8mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1962	BULTACO Sherpa	125cc	125cc 2-stroke single cylinder [51.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	BULTACO Sherpa	175cc	175cc 2-stroke single cylinder [60.9mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	BULTACO Sherpa	250cc	196cc 2-stroke single cylinder [64.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	BULTACO Metisse	250cc	244cc 2-stroke air-cooled single cylinder [72mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	BULTACO TSS Road Racer	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	BULTACO Lobito	100cc	99cc 2-stroke single cylinder [49.5mm bore x 51.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	BULTACO Metralia	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	BULTACO Pursang	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1968	BULTACO "E Bandido	360cc	346cc 2-stroke single cylinder [83mm bore x 64mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1968	BULTACO "F" Bandido	360cc	355cc 2-stroke single cylinder [84mm bore x 64mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1970	BULTACO 30	100cc	99cc 2-stroke single cylinder [49.5mm bore x 51.5mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	BULTACO M90 Astro	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	BULTACO M87 Pursang	360cc	326cc 2-stroke single cylinder [83.2mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1974	BULTACO 117 Pursang	125cc	125cc 2-stroke air-cooled single cylinder [51.5mm bore x 60mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1974	BULTACO 120 Pursang	250cc	244cc 2-stroke air-cooled single cylinder [72mm bore x 60mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1974	BULTACO 121 Pursang 360	360cc	360cc 2-stroke single cylinder [84.6mm bore x 64mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1974	BULTACO 121 Pursang MK7 360	360cc	352cc 2-stroke air-cooled single cylinder [83.7mm bore x 64mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1974	BULTACO 123-360 Astro	360cc	352cc 2-stroke air-cooled single cylinder [83.7mm bore x 64mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1975	BULTACO 135	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	BULTACO 136	360cc	363cc 2-stroke single cylinder [85mm bore x 64mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1975	BULTACO 146	360cc	355cc 2-stroke single cylinder [84mm bore x 64mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1975	BULTACO 146	360cc	360cc 2-stroke single cylinder [84.6mm bore x 64mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1977	BULTACO M123 Astro	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1980s era 250cc
1977	BULTACO M146 Astro	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1980s era 250cc
1977	BULTACO M164 Astro	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1980s era 250cc
1977	BULTACO M195 Astro	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1980s era 250cc
1985	CAGIVA WMX 125/85	125cc	125cc 2-stroke water-cooled single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	CAGIVA WMX 500/85	500cc	487cc 2-stroke water-cooled single cylinder [87mm bore x 82mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	CAGIVA WMX 125/86	125cc	125cc 2-stroke water-cooled single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	CAGIVA WMX 125Cross	125cc	125cc 2-stroke water-cooled single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1974	CAN-AM 4843	125cc	124cc 2-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	CAN-AM 4851	175cc	174cc 2-stroke single cylinder [62mm bore x 57.5mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	CAN-AM MX 250 (4863)	250cc	247cc 2-stroke single cylinder [74mm bore x 57.5mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	CAN-AM 125 MX2 (5844)	125cc	124cc 2-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	CAN-AM 125 T'NT (5841)	125cc	124cc 2-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	CAN-AM 175 MX2 (5854)	175cc	174cc 2-stroke single cylinder [62mm bore x 57.5mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	CAN-AM 175 T'NT (5851)	175cc	174cc 2-stroke single cylinder [62mm bore x 57.5mm stroke]	Bulletin #61 6/20/1978	1970s era 250cc
1975	CAN-AM 250 T'NT (5861)	250cc	247cc 2-stroke single cylinder [74mm bore x 57.5mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	CAN-AM 250MX II (5864)	250cc	247cc 2-stroke single cylinder [74mm bore x 57.5mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	CAN-AM GP250 (5860)	250cc	247cc 2-stroke single cylinder [74mm bore x 57.5mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1982	CAN-AM 8507	500cc	494cc 4-stroke single cylinder [89mm bore x 79.4mm stroke]	Bulletin #61 6/4/1982	1980s era 500cc
1964	CAPRIOLO Antelope	80cc	75cc 4-stroke overhead cam single cylinder [47mm bore x 43mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	CAPRIOLO Cheetah	125cc	124cc 4-stroke overhead cam single cylinder [55mm bore x 52mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	CAPRIOLO Gazelle	100cc	98cc 4-stroke overhead cam single cylinder [54mm bore x 43mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1976	CARABELA CE	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1976	CARABELA IVE	500cc	453cc 2-stroke single cylinder [86mm bore x 78mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1973	COOPER 250 5-V	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1962	COTTON Cougar	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	COTTON Cobra	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	COTTON Cougar	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	COTTON Telstar Racer	250cc	247cc 2-stroke air-cooled single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	DANUVIA -	125cc	124cc 2-stroke air-cooled single cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	DANUVIA Sport	125cc	124cc 2-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1955	DMW MK5 MotoX	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1955	DMW MK6 MotoX	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1956	DOT SCH Scrambler	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	DOT THX4	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DOT Scrambler	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	January 1959 approvals	1960s era 250cc
1959	DUCATI 125 Super Sport	125cc	124cc 4-stroke overhead cam single cylinder [55.2mm bore x 52mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DUCATI 175 Americano	175cc	175cc 4-stroke overhead cam single cylinder [62mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DUCATI 175 Super Sport	175cc	175cc 4-stroke overhead cam single cylinder [62mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DUCATI Americano	250cc	204cc 4-stroke overhead cam single cylinder [67mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DUCATI Scrambler	175cc	175cc 4-stroke overhead cam single cylinder [62mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DUCATI Scrambler	250cc	204cc 4-stroke overhead cam single cylinder [67mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DUCATI Super Sport	250cc	204cc 4-stroke overhead cam single cylinder [67mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	DUCATI Super Sport	125cc	111cc 4-stroke overhead cam single cylinder [52.2mm bore x 52mm stroke]	January 1959 approvals	1960s era 250cc
1962	DUCATI Diana	250cc	249cc 4-stroke overhead cam single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	DUCATI Monza	250cc	249cc 4-stroke overhead cam single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1963	DUCATI Monza Diana	250cc	249cc 4-stroke overhead cam single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	DUCATI Diana	250cc	249cc 4-stroke overhead cam single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	DUCATI Falcon	80cc	80cc 2-stroke single cylinder [47mm bore x 46.1mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	DUCATI Falcon	100cc	87cc 2-stroke single cylinder [49mm bore x 46.1mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	DUCATI Mountaineer	100cc	87cc 2-stroke single cylinder [49mm bore x 46.1mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	DUCATI Sebring	360cc	340cc 4-stroke overhead cam single cylinder [76mm bore x 75mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1968	DUCATI Scrambler	250cc	249cc 4-stroke overhead cam single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	DUCATI Scrambler	360cc	340cc 4-stroke overhead cam single cylinder [76mm bore x 75mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1969	DUCATI Desmo Diana	360cc	340cc 4-stroke overhead cam single cylinder [76mm bore x 75mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1970	DUCATI 250 Desmo	250cc	249cc 4-stroke overhead valve single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	DUCATI 450 Desmo	500cc	436cc 4-stroke overhead valve single cylinder [86mm bore x 75mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1970	DUCATI 450 Scrambler	500cc	436cc 4-stroke overhead valve single cylinder [86mm bore x 75mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	DUCATI 750GT	750cc	748cc 4-stroke air-cooled twin cylinder [80mm bore x 74.4mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1974	DUCATI 750cc SS	750cc	748cc 4-stroke twin cylinder [80mm bore x 74.4mm stroke]	Bulletin #61 6/4/1982	1970s era 750cc
1978	DUCATI 900SS	1000cc	864cc 4-stroke twin cylinder [86mm bore x 74.4mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1982	DUCATI Pantah	650cc	650cc 4-stroke twin cylinder [82mm bore x 61.5mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1982	DUCATI Pantah	750cc	748cc 4-stroke twin cylinder [88mm bore x 61.5mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1949	FRANCIS BARNETT Falcon	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1949	FRANCIS BARNETT Merlin	125cc	122cc 2-stroke single cylinder [50mm bore x 62mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1969	GARELLI KL100	100cc	98cc 2-stroke single cylinder [48mm bore x 54mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	GARELLI KL125	125cc	124cc 4-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	GARELLI KL150	175cc	148cc 4-stroke overhead valve single cylinder [58mm bore x 56mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1967	GILERA Estrada	125cc	123cc 4-stroke overhead valve single cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	GREEVES 20S Scrambler	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	GREEVES 20T Trials	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	GREEVES 20S	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	January 1959 approvals	1960s era 250cc
1959	GREEVES 20T	250cc	197cc 2-stroke single cylinder [59mm bore x 72mm stroke]	January 1959 approvals	1960s era 250cc
1961	GREEVES 24DB	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	GREEVES MCS	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	GREEVES SCS	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	GREEVES 24MDS	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	GREEVES 24TE	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	GREEVES 25DC	250cc	250cc 2-stroke twin cylinder [50mm bore x 63.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	GREEVES 24 MX Challenger	250cc	232cc 2-stroke single cylinder [64mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	GREEVES 24MX Challenger	250cc	232cc 2-stroke single cylinder [64mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1978	GTR NRE 1	750cc	742cc 4-stroke twin cylinder [73.04mm bore x 88.5mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1948	HARLEY-DAVIDSON F	1310cc	1206cc 4-stroke overhead valve twin cylinder [87.3mm bore x 100.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1948	HARLEY-DAVIDSON FL	1310cc	1206cc 4-stroke overhead valve twin cylinder [87.3mm bore x 100.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1948	HARLEY-DAVIDSON U	1310cc	1208cc 4-stroke side valve twin cylinder [84.1mm bore x 108.7mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1948	HARLEY-DAVIDSON UL	1310cc	1208cc 4-stroke side valve twin cylinder [84.1mm bore x 108.7mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1948	HARLEY-DAVIDSON W	750cc	742cc 4-stroke side valve twin cylinder [69.9mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1948	HARLEY-DAVIDSON WL	750cc	742cc 4-stroke side valve twin cylinder [69.9mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	HARLEY-DAVIDSON WR	750cc	742cc 4-stroke side valve twin cylinder [69.9mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	HARLEY-DAVIDSON WRTT	750cc	742cc 4-stroke side valve twin cylinder [69.9mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	HARLEY-DAVIDSON EL	1000cc	988cc 4-stroke overhead valve twin cylinder [84.1mm bore x 88.9mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1952	HARLEY-DAVIDSON K	750cc	742cc 4-stroke side valve twin cylinder [69.9mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1952	HARLEY-DAVIDSON KR	750cc	742cc 4-stroke side valve twin cylinder [69.9mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1952	HARLEY-DAVIDSON KRTT	750cc	742cc 4-stroke side valve twin cylinder [69.9mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	HARLEY-DAVIDSON KH	1000cc	890cc 4-stroke side valve twin cylinder [69.9mm bore x 115.9mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1954	HARLEY-DAVIDSON KHRM	1000cc	890cc 4-stroke side valve twin cylinder [69.9mm bore x 115.9mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1954	HARLEY-DAVIDSON KHRTT	1000cc	890cc 4-stroke side valve twin cylinder [69.9mm bore x 115.9mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	HARLEY-DAVIDSON 165	175cc	165cc 2-stroke single cylinder [60.3mm bore x 57.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	HARLEY-DAVIDSON FL	1310cc	1206cc 4-stroke overhead valve twin cylinder [87.3mm bore x 100.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	HARLEY-DAVIDSON FLH	1310cc	1206cc 4-stroke overhead valve twin cylinder [87.3mm bore x 100.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	HARLEY-DAVIDSON Hummer	125cc	125cc 2-stroke single cylinder [52.4mm bore x 57.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	HARLEY-DAVIDSON KHRTT	1000cc	890cc 4-stroke side valve twin cylinder [69.9mm bore x 115.9mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	HARLEY-DAVIDSON Sportster	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	HARLEY-DAVIDSON XL	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	HARLEY-DAVIDSON XLC	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	HARLEY-DAVIDSON XLCH	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	HARLEY-DAVIDSON XLH	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	HARLEY-DAVIDSON XLRTT	1000cc	886cc 4-stroke overhead valve twin cylinder [76.3mm bore x 96.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	HARLEY-DAVIDSON B	125cc	125cc 2-stroke single cylinder [52.4mm bore x 57.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HARLEY-DAVIDSON ST	175cc	165cc 2-stroke single cylinder [60.3mm bore x 57.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HARLEY-DAVIDSON STU	175cc	165cc 2-stroke single cylinder [60.3mm bore x 57.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HARLEY-DAVIDSON 125	125cc	125cc 2-stroke single cylinder [52.4mm bore x 57.9mm stroke]	January 1959 approvals	1960s era 250cc
1959	HARLEY-DAVIDSON 165	175cc	165cc 2-stroke single cylinder [60.3mm bore x 57.9mm stroke]	January 1959 approvals	1960s era 250cc
1960	HARLEY-DAVIDSON BT	175cc	165cc 2-stroke single cylinder [60.3mm bore x 57.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HARLEY-DAVIDSON Sprint C	250cc	246cc 4-stroke overhead valve single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HARLEY-DAVIDSON Sprint CR Road Racer	250cc	246cc 4-stroke overhead valve single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	HARLEY-DAVIDSON BT Pacer	175cc	176cc 2-stroke single cylinder [60.5mm bore x 61.2mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	HARLEY-DAVIDSON BTF Ranger	175cc	166cc 2-stroke single cylinder [60.5mm bore x 57.9mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	HARLEY-DAVIDSON BTH Scat	175cc	176cc 2-stroke single cylinder [60.5mm bore x 61.2mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	HARLEY-DAVIDSON H Sprint	250cc	246cc 4-stroke overhead valve single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1963	HARLEY-DAVIDSON BT Pacer	175cc	176cc 2-stroke single cylinder [60.5mm bore x 61.2mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1963	HARLEY-DAVIDSON BTH Scat	175cc	176cc 2-stroke single cylinder [60.5mm bore x 61.2mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1963	HARLEY-DAVIDSON BTU Pacer	175cc	176cc 2-stroke single cylinder [60.5mm bore x 61.2mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	HARLEY-DAVIDSON Sprint CR	250cc	246cc 4-stroke overhead valve single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	HARLEY-DAVIDSON CRS	250cc	246cc 4-stroke overhead valve single cylinder [66mm bore x 72mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	HARLEY-DAVIDSON CR Sprint	250cc	248cc 4-stroke overhead valve single cylinder [72mm bore x 61mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	HARLEY-DAVIDSON M50	50cc	50cc 2-stroke single cylinder [38.8mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	HARLEY-DAVIDSON M50 Sport	50cc	50cc 2-stroke single cylinder [38.8mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	HARLEY-DAVIDSON CRS	250cc	248cc 4-stroke overhead valve single cylinder [72mm bore x 61mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	HARLEY-DAVIDSON H Sprint	250cc	248cc 4-stroke overhead valve single cylinder [72mm bore x 61mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	HARLEY-DAVIDSON M65	80cc	64cc 2-stroke single cylinder [44mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1968	HARLEY-DAVIDSON ML	125cc	124cc 2-stroke single cylinder [56.1mm bore x 50mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	HARLEY-DAVIDSON XLH	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 5/15/1968	Hot Rod Multis
1969	HARLEY-DAVIDSON 750 Sportster	750cc	748cc 4-stroke overhead valve twin cylinder [76.3mm bore x 81.8mm stroke]	Bulletin #61 3/1/1969	1970s era 750cc
1969	HARLEY-DAVIDSON ERS Scrambler	360cc	344cc 4-stroke single cylinder [74mm bore x 80mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1969	HARLEY-DAVIDSON SS Sprint	360cc	344cc 4-stroke single cylinder [74mm bore x 80mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1970	HARLEY-DAVIDSON MSR	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	HARLEY-DAVIDSON SS	750cc	688cc 4-stroke twin cylinder [74mm bore x 80mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1970	HARLEY-DAVIDSON XLCH	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 10/2/1973	Hot Rod Multis
1970	HARLEY-DAVIDSON XLH	1000cc	882cc 4-stroke overhead valve twin cylinder [76.2mm bore x 96.8mm stroke]	Bulletin #61 10/2/1973	Hot Rod Multis
1970	HARLEY-DAVIDSON XR	750cc	748cc 4-stroke overhead valve twin cylinder [76.3mm bore x 81.8mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	HARLEY-DAVIDSON XR750	750cc	750cc 4-stroke overhead valve twin cylinder [79.4mm bore x 75.8mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	HARLEY-DAVIDSON SR100	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	HARLEY-DAVIDSON SS350	360cc	344cc 4-stroke single cylinder [74mm bore x 80mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1973	HARLEY-DAVIDSON SX350	360cc	344cc 4-stroke single cylinder [74mm bore x 80mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1973	HARLEY-DAVIDSON TX125	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	HARLEY-DAVIDSON X90	100cc	90cc 2-stroke single cylinder [48mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	HARLEY-DAVIDSON Z90	100cc	90cc 2-stroke single cylinder [48mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1974	HARLEY-DAVIDSON RR250	250cc	246cc 2-stroke water-cooled twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1974	HARLEY-DAVIDSON SR100	100cc	98cc 2-stroke air-cooled single cylinder [50mm bore x 50mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1974	HARLEY-DAVIDSON SX125	125cc	123cc 2-stroke air-cooled single cylinder [56mm bore x 50mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1974	HARLEY-DAVIDSON SX175	175cc	174cc 2-stroke air-cooled single cylinder [61mm bore x 59.6mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1974	HARLEY-DAVIDSON SX250	250cc	243cc 2-stroke single cylinder [72mm bore x 59.6mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	HARLEY-DAVIDSON 500WC Varese	500cc	488cc 2-stroke water-cooled twin cylinder [72mm bore x 60mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1975	HARLEY-DAVIDSON MX250	250cc	243cc 2-stroke single cylinder [72mm bore x 59.6mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1975	HARLEY-DAVIDSON RR250	250cc	246cc 2-stroke water-cooled twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 10/31/1977	1970s era 360cc
1976	HARLEY-DAVIDSON MX360	360cc	342cc 2-stroke single cylinder [80mm bore x 68mm stroke]	Bulletin #61 10/31/1977	1970s era 360cc
1978	HARLEY-DAVIDSON XLCR1000	1000cc	998cc 4-stroke overhead valve twin cylinder [81mm bore x 96.8mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1984	HARLEY-DAVIDSON HD500R	500cc	494cc 4-stroke single cylinder [89mm bore x 79.4mm stroke]	Bulletin #61 6/22/1989	1980s era 500cc
1984	HARLEY-DAVIDSON HD560R	560cc	562cc 4-stroke single cylinder [94mm bore x 81mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1959	HERCULES J-BE-K	125cc	115cc 2-stroke single cylinder [52mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1975	HERCULES 125MX	125cc	124cc 2-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1975	HERCULES W-2000 Wankel	360cc	294cc Rotary [- bore x - stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1966	HODAKA Ace 90	100cc	90cc 2-stroke single cylinder [48mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	HODAKA Ace 90	100cc	90cc 2-stroke single cylinder [48mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1968	HODAKA Ace 100	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1960s era 250cc
1970	HODAKA Ace 100/92A (100-B)	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	HODAKA Ace 100/MX	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	HODAKA 125/94	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1959	HONDA C71	250cc	248cc 4-stroke overhead cam twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HONDA CB71	250cc	248cc 4-stroke overhead cam twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HONDA CB92	125cc	124cc 4-stroke overhead cam twin cylinder [44mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HONDA CR71 Dream Super Sport	250cc	248cc 4-stroke overhead cam twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HONDA CR76 Dream Super Sport	360cc	306cc 4-stroke overhead cam twin cylinder [60mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	HONDA Henly C90	125cc	124cc 4-stroke overhead cam twin cylinder [44mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	HONDA Sports CB92	125cc	124cc 4-stroke overhead cam twin cylinder [44mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CA100	50cc	49cc 4-stroke overhead valve single cylinder [40mm bore x 39mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CA110	50cc	49cc 4-stroke overhead valve single cylinder [40mm bore x 39mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CA72	250cc	248cc 4-stroke overhead cam twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CA77	360cc	306cc 4-stroke overhead cam twin cylinder [60mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1961	HONDA CA95	175cc	154cc 4-stroke overhead cam twin cylinder [49mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CB72	250cc	248cc 4-stroke overhead cam twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CB77	360cc	306cc 4-stroke overhead cam twin cylinder [60mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1961	HONDA CB95R	125cc	124cc 4-stroke overhead cam twin cylinder [44mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CL72	250cc	248cc 4-stroke overhead cam twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	HONDA CL77	360cc	306cc 4-stroke overhead cam twin cylinder [60mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1962	HONDA CA105T	50cc	54cc 4-stroke overhead valve single cylinder [42mm bore x 39mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	HONDA CB77	360cc	306cc 4-stroke overhead cam twin cylinder [60mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1964	HONDA CA200	100cc	87cc 4-stroke overhead valve single cylinder [49mm bore x 46mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	HONDA CB160	175cc	162cc 4-stroke overhead cam twin cylinder [50mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	HONDA CB450	500cc	444cc 4-stroke DOHC twin cylinder [70mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1965	HONDA S65	80cc	63cc 4-stroke overhead cam single cylinder [44mm bore x 41.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	HONDA S90	100cc	90cc 4-stroke overhead cam single cylinder [50mm bore x 45.6mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	HONDA CA160	175cc	162cc 4-stroke overhead cam twin cylinder [50mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	HONDA CL160	175cc	162cc 4-stroke overhead cam twin cylinder [50mm bore x 41mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	HONDA CM91	100cc	90cc 4-stroke overhead cam single cylinder [50mm bore x 45.6mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	HONDA CT90	100cc	90cc 4-stroke overhead cam single cylinder [50mm bore x 45.6mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	HONDA CL90	100cc	88cc 4-stroke overhead cam single cylinder [50mm bore x 45mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	HONDA CA175 Tour	175cc	174cc 4-stroke overhead cam twin cylinder [52mm bore x 41mm stroke]	Bulletin #61 3/1/1969	1960s era 250cc
1968	HONDA CB350 Super	360cc	326cc 4-stroke overhead cam twin cylinder [64mm bore x 50.6mm stroke]	Bulletin #61 3/1/1969	1960s era 750cc
1968	HONDA CB450K1	500cc	444cc 4-stroke overhead cam twin cylinder [70mm bore x 57.8mm stroke]	Bulletin #61 3/1/1969	1960s era 750cc
1968	HONDA CL125 SCR	125cc	124cc 4-stroke overhead cam twin cylinder [44mm bore x 41mm stroke]	Bulletin #61 3/1/1969	1960s era 250cc
1968	HONDA CL175 SCR	175cc	174cc 4-stroke overhead cam twin cylinder [52mm bore x 41mm stroke]	Bulletin #61 3/1/1969	1960s era 250cc
1968	HONDA CL350 SCR	360cc	326cc 4-stroke overhead cam twin cylinder [64mm bore x 50.6mm stroke]	Bulletin #61 3/1/1969	1960s era 750cc
1968	HONDA CL450	500cc	444cc 4-stroke overhead cam twin cylinder [70mm bore x 57.8mm stroke]	Bulletin #61 3/1/1969	1960s era 750cc
1968	HONDA SS125 Super	125cc	124cc 4-stroke overhead cam twin cylinder [44mm bore x 41mm stroke]	Bulletin #61 3/1/1969	1960s era 250cc
1970	HONDA CB750	750cc	736cc 4-stroke four cylinder [61mm bore x 63mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1970	HONDA CB750K1	750cc	736cc 4-stroke four cylinder [61mm bore x 63mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1970	HONDA SL100	100cc	99cc 4-stroke single cylinder [50.5mm bore x 49.5mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1970	HONDA SL350	360cc	326cc 4-stroke twin cylinder [64mm bore x 50.6mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1970	HONDA SL350K1	360cc	326cc 4-stroke twin cylinder [64mm bore x 50.6mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1970	HONDA SL90	100cc	90cc 4-stroke single cylinder [50mm bore x 45.6mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	HONDA CB350 Four	360cc	348cc 4-stroke four cylinder [47mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1972	HONDA CB500K1	500cc	500cc 4-stroke four cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	HONDA SL125K1	125cc	122cc 4-stroke single cylinder [56mm bore x 49.5mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	HONDA XL250	250cc	249cc 4-stroke single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	HONDA CR125M	125cc	123cc 2-stroke air-cooled single cylinder [56mm bore x 50mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1973	HONDA CR250M	250cc	248cc 2-stroke single cylinder [70mm bore x 64.4mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	HONDA MT125	125cc	123cc 2-stroke air-cooled single cylinder [56mm bore x 50mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1973	HONDA MT250	250cc	248cc 2-stroke air-cooled single cylinder [70mm bore x 64.4mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1973	HONDA XL175	175cc	174cc 4-stroke air-cooled single cylinder [64mm bore x 54mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1973	HONDA XL350	360cc	348cc 4-stroke air-cooled single cylinder [79mm bore x 71mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1973	HONDA XR75	80cc	72cc 4-stroke single cylinder [47mm bore x 41.4mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1974	HONDA CB200	250cc	198cc 4-stroke air-cooled twin cylinder [55.5mm bore x 41mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1974	HONDA CB360	360cc	356cc 4-stroke air-cooled twin cylinder [67mm bore x 50.6mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1974	HONDA CB550	560cc	544cc 4-stroke air-cooled four cylinder [58.5mm bore x 50.6mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1974	HONDA MR50	50cc	50cc 2-stroke air-cooled single cylinder [40mm bore x 39.7mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1975	HONDA CB400F	500cc	408cc 4-stroke four cylinder [51mm bore x 50mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1975	HONDA CB500T	500cc	498cc 4-stroke twin cylinder [70mm bore x 64.8mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1975	HONDA CB550F	560cc	544cc 4-stroke four cylinder [58.5mm bore x 50.6mm stroke]	Bulletin #61 6/4/1982	1970s era 750cc
1975	HONDA CB750F	750cc	736cc 4-stroke four cylinder [61mm bore x 63mm stroke]	Bulletin #61 6/4/1982	1970s era 750cc
1975	HONDA CR250M1	250cc	248cc 2-stroke single cylinder [70mm bore x 64.4mm stroke]	Bulletin #61 6/22/1989	1970s era 250cc
1975	HONDA GL1000	1000cc	1000cc 4-stroke water-cooled four cylinder [72mm bore x 61.4mm stroke]	Bulletin #61 8/5/1975	Hot Rod Multis
1975	HONDA MR175	175cc	171cc 2-stroke single cylinder [66mm bore x 50mm stroke]	Bulletin #61 6/4/1982	1970s era 250cc
1975	HONDA TL250	250cc	249cc 4-stroke single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 6/4/1982	1970s era 250cc
1977	HONDA CB750F-77	750cc	736cc 4-stroke four cylinder [61mm bore x 63mm stroke]	Bulletin #61 6/4/1982	Hot Rod Multis
1977	HONDA MT125-RII	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1978	HONDA CB400T1	500cc	396cc 4-stroke twin cylinder [70.5mm bore x 50.6mm stroke]	Bulletin #61 6/4/1982	Hot Rod Multis
1978	HONDA CR250R	250cc	248cc 2-stroke single cylinder [70mm bore x 64.4mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1978	HONDA CX500	500cc	496cc 4-stroke water-cooled twin cylinder [78mm bore x 52mm stroke]	Bulletin #61 6/4/1982	Hot Rod Multis
1978	HONDA XL250S	250cc	249cc 4-stroke single cylinder [74mm bore x 57.8mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1979	HONDA CB750F	750cc	748cc 4-stroke four cylinder [62mm bore x 62mm stroke]	Bulletin #61 6/4/1982	Hot Rod Multis
1979	HONDA XR500 ("Pentroof")	500cc	498cc 4-stroke air-cooled single cylinder [89mm bore x 80mm stroke]	Bulletin #61 6/4/1982	1980s era 500cc
1980	HONDA CR250R	250cc	248cc 2-stroke single cylinder [70mm bore x 64.4mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1981	HONDA CB900F	1000cc	900cc 4-stroke four cylinder [64.5mm bore x 69mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1981	HONDA CR250R	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1981	HONDA CR450R	500cc	431cc 2-stroke single cylinder [85mm bore x 76mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1981	HONDA NS750	750cc	750cc 4-stroke water-cooled twin cylinder [87mm bore x 63mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1981	HONDA XR500R ("Pentroof" with reed valve)	500cc	498cc 4-stroke air-cooled single cylinder [89mm bore x 80mm stroke]	Bulletin #61 6/4/1982	1980s era 500cc
1982	HONDA CR480R	500cc	473cc 2-stroke single cylinder [89mm bore x 76mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1982	HONDA VF750	750cc	748cc 4-stroke four cylinder [70mm bore x 48.6mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1983	HONDA CR250R	250cc	246cc 2-stroke single cylinder [66mm bore x 72mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1983	HONDA CR480R	500cc	473cc 2-stroke single cylinder [89mm bore x 76mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1983	HONDA RS750	750cc	750cc 4-stroke air-cooled twin cylinder [79.5mm bore x 75.5mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1983	HONDA VF750F	750cc	748cc 4-stroke four cylinder [70mm bore x 48.6mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1983	HONDA XL600R (RFVC)	600cc	589cc 4-stroke air-cooled single cylinder [100mm bore x 75mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1983	HONDA XR500R (RFVC)	500cc	499cc 4-stroke air-cooled single cylinder [92mm bore x 75mm stroke]	Bulletin #61 6/22/1989	1980s era 500cc
1985	HONDA CR250R	250cc	246cc 2-stroke water-cooled single cylinder [66mm bore x 72mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	HONDA CR500R	500cc	491cc 2-stroke water-cooled single cylinder [89mm bore x 79mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1985	HONDA RS500D (RFVC)	500cc	499cc 4-stroke air-cooled single cylinder [92mm bore x 75mm stroke]	Bulletin #61 6/22/1989	1980s era 500cc
1985	HONDA RS500D (RS600D)(RFVC)	600cc	589cc 4-stroke air-cooled single cylinder [100mm bore x 75mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1985	HONDA RS660D (RFVC)	660cc	662cc 4-stroke air-cooled single cylinder [102.61mm bore x 80mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	HONDA CR125R	125cc	124cc 2-stroke water-cooled single cylinder [54mm bore x 54mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	HONDA CR250R	250cc	249cc 2-stroke water-cooled single cylinder [66.4mm bore x 72mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	HONDA CR500R	500cc	491cc 2-stroke water-cooled single cylinder [89mm bore x 79mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	HONDA VFR750R	750cc	748cc 4-stroke four cylinder [70mm bore x 48.6mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1987	HONDA CR125	125cc	125cc 2-stroke water-cooled single cylinder [54mm bore x 54.5mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	HONDA CR250	250cc	250cc 2-stroke water-cooled single cylinder [66.5mm bore x 72mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	HONDA CR500	500cc	491cc 2-stroke water-cooled single cylinder [89mm bore x 79mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1988	HONDA CR125	125cc	125cc 2-stroke water-cooled single cylinder [54mm bore x 54.5mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1988	HONDA CR250	250cc	249cc 2-stroke single cylinder [66.4mm bore x 72mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1955	HOREX Imperator	500cc	392cc 4-stroke overhead cam twin cylinder [61.5mm bore x 66mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1968	HUSQVARNA Husky	250cc	245cc 2-stroke single cylinder [69.5mm bore x 64.5mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	HUSQVARNA Viking	360cc	351cc 2-stroke single cylinder [78.75mm bore x 72mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1972	HUSQVARNA 125CR M-X	125cc	124cc 2-stroke single cylinder [55mm bore x 52mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	HUSQVARNA 250CR M-X	250cc	245cc 2-stroke single cylinder [69.5mm bore x 64.5mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	HUSQVARNA 250CR M-X	360cc	341cc 2-stroke single cylinder [82mm bore x 64.5mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1972	HUSQVARNA 250CR M-X	360cc	350cc 2-stroke single cylinder [81.5mm bore x 67mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1972	HUSQVARNA 250CR M-X	360cc	351cc 2-stroke single cylinder [78.75mm bore x 72mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1972	HUSQVARNA 250WR M-X	250cc	245cc 2-stroke single cylinder [69.55mm bore x 64.5mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	HUSQVARNA 400CR M-X	500cc	396cc 2-stroke single cylinder [81.5mm bore x 76mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	HUSQVARNA 450WR Cross Country	500cc	454cc 2-stroke single cylinder [84mm bore x 82mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1975	HUSQVARNA 175cc	175cc	157cc 2-stroke single cylinder [62mm bore x 52mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	HUSQVARNA 250CR	250cc	245cc 2-stroke single cylinder [69.5mm bore x 64.5mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1975	HUSQVARNA 360CR	360cc	350cc 2-stroke single cylinder [81.5mm bore x 67mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1986	HUSQVARNA -	500cc	488cc 2-stroke single cylinder [86mm bore x 84mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	HUSQVARNA 250MX	250cc	245cc 2-stroke single cylinder [69.5mm bore x 64.5mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	HUSQVARNA 250CR	250cc	246cc 2-stroke water-cooled single cylinder [66.5mm bore x 70.8mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1948	INDIAN CZ	125cc	123cc 2-stroke single cylinder [52mm bore x 58mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1948	INDIAN Scout	750cc	744cc 4-stroke side valve twin cylinder [73mm bore x 88.9mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	INDIAN Scout	500cc	436cc 4-stroke overhead valve twin cylinder [60.3mm bore x 76.2mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	INDIAN Chief	1310cc	1310cc 4-stroke side valve twin cylinder [82.6mm bore x 122.2mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1950	INDIAN Warrior	500cc	498cc 4-stroke overhead valve twin cylinder [64.5mm bore x 76.2mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1955	INDIAN Fire Arrow	250cc	248cc 4-stroke overhead valve single cylinder [64mm bore x 77mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1955	INDIAN Trailblazer	750cc	692cc 4-stroke overhead valve twin cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1955	INDIAN Woodsman	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1956	INDIAN Scrambler	360cc	346cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	INDIAN Apache	750cc	690cc 4-stroke overhead valve twin cylinder [69.9mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	INDIAN Hounds Arrow	250cc	248cc 4-stroke overhead valve single cylinder [64mm bore x 77mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	INDIAN Lance	175cc	148cc 2-stroke single cylinder [56mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	INDIAN Tomahawk	560cc	510cc 4-stroke overhead valve twin cylinder [69.9mm bore x 66.4mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	INDIAN Westerner	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	INDIAN Apache Intercepter	750cc	692cc 4-stroke overhead valve twin cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	INDIAN Arrow	250cc	218cc 4-stroke overhead valve single cylinder [60.3mm bore x 76.2mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	INDIAN Chief	750cc	692cc 4-stroke overhead valve twin cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	INDIAN Hounds Arrow	250cc	248cc 4-stroke overhead valve single cylinder [69.9mm bore x 64.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	INDIAN Tomahawk	500cc	496cc 4-stroke overhead valve twin cylinder [69.9mm bore x 64.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	INDIAN Bonneville Chief	1310cc	1310cc 4-stroke side valve twin cylinder [82.6mm bore x 122.2mm stroke]	January 1959 approvals	Hot Rod Multis
1959	INDIAN Chief	1310cc	1206cc 4-stroke side valve twin cylinder [82.6mm bore x 112.7mm stroke]	January 1959 approvals	Hot Rod Multis
1959	INDIAN FDA-Scout	750cc	744cc 4-stroke side valve twin cylinder [73mm bore x 88.9mm stroke]	January 1959 approvals	Hot Rod Multis
1959	INDIAN LS	500cc	498cc 4-stroke side valve twin cylinder [64.5mm bore x 76.2mm stroke]	January 1959 approvals	1960s era 750cc
1959	INDIAN Fire Arrow	250cc	248cc 4-stroke overhead valve single cylinder [69.9mm bore x 64.5mm stroke]	January 1959 approvals	1960s era 250cc
1959	INDIAN Tomahawk	500cc	495cc 4-stroke overhead valve single cylinder [64mm bore x 77mm stroke]	January 1959 approvals	1960s era 750cc
1959	INDIAN Apache	750cc	692cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	January 1959 approvals	Hot Rod Multis
1959	INDIAN Lance MK1	175cc	148cc 2-stroke single cylinder [56mm bore x 60mm stroke]	January 1959 approvals	1960s era 250cc
1959	INDIAN Interceptor	750cc	692cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	January 1959 approvals	Hot Rod Multis
1952	JAMES MK2F Comet	100cc	99cc 2-stroke air-cooled single cylinder [47mm bore x 57mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAMES L25S Scrambler	250cc	248cc 2-stroke single cylinder [65.9mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAMES L25T Trials	250cc	248cc 2-stroke single cylinder [65.9mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1954	JAWA 500	500cc	488cc 4-stroke overhead cam twin cylinder [65mm bore x 73.6mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	JAWA 356 Road	175cc	172cc 2-stroke single cylinder [58mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAWA 958 Scrambler	175cc	172cc 2-stroke single cylinder [58mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAWA CZ Road	125cc	123cc 2-stroke single cylinder [52mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAWA CZ Scrambler	360cc	344cc 2-stroke twin cylinder [58mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	JAWA CZ353 Roadster	250cc	249cc 2-stroke single cylinder [65mm bore x 75mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAWA CZ353 Scr.	250cc	249cc 2-stroke air-cooled single cylinder [65mm bore x 75mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAWA CZ354 Roadster	360cc	344cc 2-stroke twin cylinder [58mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	JAWA CZ557 MotoX	250cc	249cc 2-stroke single cylinder [65mm bore x 75mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAWA CZ558 MotoX	360cc	344cc 2-stroke twin cylinder [58mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	JAWA CZ957 Scr.	125cc	123cc 2-stroke single cylinder [52mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	JAWA 554 Scrambler	360cc	344cc 2-stroke twin cylinder [58mm bore x 65mm stroke]	January 1959 approvals	1960s era 750cc
1961	JAWA 450	175cc	172cc 2-stroke single cylinder [58mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	JAWA 453	125cc	123cc 2-stroke single cylinder [52mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	JAWA 579/01 MotoX	250cc	249cc 2-stroke single cylinder [65mm bore x 75mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1969	JAWA-CZ 980	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1969	JAWA-CZ 980	360cc	357cc 2-stroke single cylinder [79.5mm bore x 72mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1966	KAWASAKI W1	650cc	624cc 4-stroke overhead valve twin cylinder [74mm bore x 72.6mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1967	KAWASAKI A1	250cc	248cc 2-stroke twin cylinder [53mm bore x 56mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	KAWASAKI A1R	250cc	248cc 2-stroke twin cylinder [53mm bore x 56mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	KAWASAKI C2	125cc	116cc 2-stroke single cylinder [53.1mm bore x 52.6mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1967	KAWASAKI D1	100cc	100cc 2-stroke single cylinder [52mm bore x 47mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	KAWASAKI F1	175cc	169cc 2-stroke single cylinder [62mm bore x 56mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	KAWASAKI F2	175cc	169cc 2-stroke single cylinder [62mm bore x 56mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	KAWASAKI F21M	250cc	239cc 2-stroke single cylinder [70mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1968	KAWASAKI A7	360cc	338cc 2-stroke twin cylinder [62mm bore x 56mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1968	KAWASAKI W2SS	650cc	624cc 4-stroke overhead valve twin cylinder [74mm bore x 72.6mm stroke]	Bulletin #61 5/15/1968	Hot Rod Multis
1969	KAWASAKI F3	175cc	169cc 2-stroke single cylinder [62mm bore x 56mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	KAWASAKI F4	250cc	239cc 2-stroke single cylinder [70mm bore x 62mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	KAWASAKI G3	100cc	90cc 2-stroke single cylinder [47mm bore x 51.8mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	KAWASAKI H1	500cc	498cc 2-stroke three cylinder [60mm bore x 58.8mm stroke]	Bulletin #61 3/1/1969	1970s era 750cc
1970	KAWASAKI F5 (Big Horn)	360cc	347cc 2-stroke single cylinder [80.5mm bore x 68.1mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1970	KAWASAKI F9	360cc	347cc 2-stroke single cylinder [80.5mm bore x 68.1mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1970	KAWASAKI G31M	100cc	99cc 2-stroke single cylinder [49.3mm bore x 51.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	KAWASAKI G4TR	100cc	97cc 2-stroke single cylinder [52mm bore x 45.6mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	KAWASAKI 100G3TRA	100cc	100cc 2-stroke single cylinder [49.5mm bore x 51.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	KAWASAKI F6 125E	125cc	125cc 2-stroke single cylinder [52mm bore x 58.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	KAWASAKI F7 175E	175cc	175cc 2-stroke single cylinder [61.5mm bore x 58.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	KAWASAKI F8 (250 Enduro)	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	KAWASAKI F9 (Big Horn)	360cc	347cc 2-stroke single cylinder [80.5mm bore x 68.1mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1972	KAWASAKI F9 (Big Horn)	360cc	355cc 2-stroke single cylinder [81.5mm bore x 68mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1972	KAWASAKI G5	100cc	100cc 2-stroke single cylinder [49.5mm bore x 51.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	KAWASAKI H2	750cc	747cc 2-stroke three cylinder [71mm bore x 63mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	KAWASAKI S2	360cc	348cc 2-stroke air-cooled three cylinder [53.1mm bore x 52.3mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	KAWASAKI F11	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	KAWASAKI KX125	125cc	125cc 2-stroke single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1973	KAWASAKI KX250	250cc	250cc 2-stroke single cylinder [70mm bore x 64.9mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1973	KAWASAKI KX250 (domestic model)	250cc	246cc 2-stroke single cylinder [69.5mm bore x 64.9mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1973	KAWASAKI KX450	500cc	441cc 2-stroke single cylinder [86mm bore x 76mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1973	KAWASAKI S1	250cc	249cc 2-stroke three cylinder [45mm bore x 52.3mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1973	KAWASAKI Z1	1000cc	904cc 4-stroke four cylinder [66mm bore x 66mm stroke]	Bulletin #61 10/2/1973	Hot Rod Multis
1974	KAWASAKI G3SSD	100cc	90cc 2-stroke single cylinder [47mm bore x 51.8mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	KAWASAKI G4TRD	100cc	100cc 2-stroke single cylinder [49.5mm bore x 51.8mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	KAWASAKI G5B	100cc	100cc 2-stroke single cylinder [49.5mm bore x 51.8mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	KAWASAKI H2-S (Expert Comp)	750cc	747cc 2-stroke three cylinder [71mm bore x 63mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1974	KAWASAKI KS125	125cc	125cc 2-stroke single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	KAWASAKI KZ400	500cc	398cc 4-stroke twin cylinder [64mm bore x 62mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1974	KAWASAKI MC1	100cc	90cc 2-stroke air-cooled single cylinder [47mm bore x 51.8mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	KAWASAKI MC1 M	100cc	90cc 2-stroke single cylinder [47mm bore x 51.8mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	KAWASAKI S3	500cc	399cc 2-stroke three cylinder [57mm bore x 52.3mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1974	KAWASAKI Z1A	1000cc	904cc 4-stroke four cylinder [66mm bore x 66mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1974	KAWASAKI Z2 (Expert Comp)	750cc	748cc 4-stroke overhead cam four cylinder [64mm bore x 58mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1975	KAWASAKI KR250	250cc	250cc 2-stroke water-cooled twin cylinder [54mm bore x 54.4mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1975	KAWASAKI KR750	750cc	741cc 2-stroke water-cooled three cylinder [68mm bore x 68mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1975	KAWASAKI KX400	500cc	401cc 2-stroke single cylinder [82mm bore x 76mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1975	KAWASAKI Z1B	1000cc	904cc 4-stroke four cylinder [66mm bore x 66mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1976	KAWASAKI KZ750	750cc	746cc 4-stroke twin cylinder [78mm bore x 78mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1976	KAWASAKI KZ900	1000cc	904cc 4-stroke four cylinder [66mm bore x 66mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1977	KAWASAKI KX250	250cc	250cc 2-stroke single cylinder [70mm bore x 64.9mm stroke]	Bulletin #61 6/20/1978	1980s era 250cc
1977	KAWASAKI KZ1000	1310cc	1016cc 4-stroke four cylinder [70mm bore x 66mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1977	KAWASAKI KZ650	650cc	652cc 4-stroke four cylinder [62mm bore x 54mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1978	KAWASAKI KZ1000	1310cc	1016cc 4-stroke four cylinder [70mm bore x 66mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1978	KAWASAKI KZ1000 Z1R	1310cc	1016cc 4-stroke four cylinder [70mm bore x 66mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1979	KAWASAKI KZ1000	1310cc	1016cc 4-stroke four cylinder [70mm bore x 66mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1979	KAWASAKI KZ650	650cc	652cc 4-stroke four cylinder [62mm bore x 54mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1980	KAWASAKI KX250-A6	250cc	250cc 2-stroke single cylinder [70mm bore x 64.9mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1980	KAWASAKI KX420-A1	500cc	422cc 2-stroke single cylinder [83mm bore x 78mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1980	KAWASAKI KZ750E	750cc	740cc 4-stroke four cylinder [66mm bore x 54mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1981	KAWASAKI KZ1000-JE	1000cc	1000cc 4-stroke four cylinder [69.4mm bore x 66mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1982	KAWASAKI KX250-B1	250cc	250cc 2-stroke single cylinder [70mm bore x 64.9mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1982	KAWASAKI KX500	500cc	500cc 2-stroke single cylinder [86mm bore x 86mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1982	KAWASAKI KZ1000-R1	1000cc	1000cc 4-stroke four cylinder [69.4mm bore x 66mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1982	KAWASAKI KZ750 R&L	750cc	740cc 4-stroke four cylinder [66mm bore x 54mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1983	KAWASAKI ZX750-A	750cc	740cc 4-stroke four cylinder [66mm bore x 54mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1985	KAWASAKI KX125-D1	125cc	125cc 2-stroke water-cooled single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	KAWASAKI KX250-D1	250cc	250cc 2-stroke water-cooled single cylinder [70mm bore x 64.9mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	KAWASAKI KX500-B1	500cc	500cc 2-stroke water-cooled single cylinder [86mm bore x 86mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	KAWASAKI KL600B2	560cc	565cc 4-stroke single cylinder [96mm bore x 78mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	KAWASAKI KX125-E1	125cc	125cc 2-stroke water-cooled single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	KAWASAKI KX250-D2	250cc	250cc 2-stroke water-cooled single cylinder [70mm bore x 64.9mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	KAWASAKI KX500-B2	500cc	500cc 2-stroke water-cooled single cylinder [86mm bore x 86mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1987	KAWASAKI KX125-E2	125cc	125cc 2-stroke water-cooled single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	KAWASAKI KX250-E1	250cc	250cc 2-stroke water-cooled single cylinder [67.4mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	KAWASAKI KX500-C1	500cc	500cc 2-stroke water-cooled single cylinder [86mm bore x 86mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1987	KAWASAKI ZX750-F1	750cc	748cc 4-stroke four cylinder [68mm bore x 51.5mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1988	KAWASAKI KX125-F1	125cc	125cc 2-stroke water-cooled single cylinder [56mm bore x 50.6mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1988	KAWASAKI KX250-F1	250cc	250cc 2-stroke water-cooled single cylinder [67.4mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1988	KAWASAKI KX500-D1	500cc	500cc 2-stroke water-cooled single cylinder [86mm bore x 86mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	KTM 125MX	125cc	124cc 2-stroke water-cooled single cylinder [54mm bore x 54mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	KTM 250MX	250cc	247cc 2-stroke water-cooled single cylinder [67.5mm bore x 69mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	KTM 500MX	500cc	485cc 2-stroke water-cooled single cylinder [89mm bore x 78mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1974	LAVERDA 3CL	1000cc	981cc 4-stroke three cylinder [75mm bore x 74mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1956	MAICO Scrambler	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	MAICO Scrambler	175cc	174cc 2-stroke single cylinder [61mm bore x 59.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	MAICO Endro	360cc	345cc 2-stroke single cylinder [77mm bore x 74mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1967	MAICO Endro	360cc	354cc 2-stroke single cylinder [77mm bore x 76mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1970	MAICO T-5 250	250cc	247cc 2-stroke air-cooled single cylinder [67mm bore x 70mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	MAICO X-5 400	500cc	386cc 2-stroke air-cooled single cylinder [77mm bore x 83mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	MAICO K501	500cc	501cc 2-stroke single cylinder [91.6mm bore x 76mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	MAICO 250	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1973	MAICO 400	500cc	386cc 2-stroke single cylinder [77mm bore x 83mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1973	MAICO 450	500cc	438cc 2-stroke single cylinder [82mm bore x 83mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1981	MAICO Mega 2 Type 352	500cc	488cc 2-stroke single cylinder [86.5mm bore x 83mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1981	MAICO Mega 2-250 Reed Valve	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1949	MATCHLESS G3L	360cc	348cc 4-stroke overhead valve single cylinder [69mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	MATCHLESS G3LS Clubman	360cc	348cc 4-stroke overhead valve single cylinder [69mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	MATCHLESS G80	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	MATCHLESS G80S Clubman	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	MATCHLESS G9 Super Clubman	500cc	498cc 4-stroke overhead valve twin cylinder [66mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	MATCHLESS G3LC Clubman	360cc	348cc 4-stroke overhead valve single cylinder [69mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	MATCHLESS G9 Super Clubman	500cc	498cc 4-stroke overhead valve twin cylinder [66mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1952	MATCHLESS G3LCS	360cc	348cc 4-stroke overhead valve single cylinder [69mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1952	MATCHLESS G80C	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1952	MATCHLESS G80CS Comp.	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	MATCHLESS G9B	560cc	544cc 4-stroke overhead valve twin cylinder [69mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1956	MATCHLESS G11	600cc	592cc 4-stroke overhead valve twin cylinder [72mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	MATCHLESS G11CS	600cc	592cc 4-stroke overhead valve twin cylinder [72mm bore x 72.8mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1957	MATCHLESS G80CS	500cc	497cc 4-stroke overhead valve single cylinder [86mm bore x 85.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	MATCHLESS G80R	500cc	497cc 4-stroke overhead valve single cylinder [86mm bore x 85.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	MATCHLESS G80S	500cc	497cc 4-stroke overhead valve single cylinder [82.5mm bore x 93mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1958	MATCHLESS G12 Super Clubman	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.35mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	MATCHLESS G12 Super Hurricane	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.35mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	MATCHLESS G80CS MotoX	500cc	497cc 4-stroke overhead valve single cylinder [86mm bore x 85.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1958	MATCHLESS G80CST Typhoon	600cc	597cc 4-stroke overhead valve single cylinder [89mm bore x 96mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1958	MATCHLESS Road Trim	250cc	246cc 4-stroke overhead valve single cylinder [70mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	MATCHLESS Scrambler	250cc	246cc 4-stroke overhead valve single cylinder [70mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	MATCHLESS G12 Road Clubman	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.3mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	MATCHLESS G12CS Scrambler	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.3mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	MATCHLESS G2CS Scrambler	250cc	249cc 4-stroke overhead valve single cylinder [69.85mm bore x 64.85mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	MATCHLESS G80TCS Typhoon	600cc	588cc 4-stroke overhead valve single cylinder [87.3mm bore x 98.2mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1959	MATCHLESS Road Model	250cc	249cc 4-stroke overhead valve single cylinder [69.85mm bore x 64.85mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	MATCHLESS G2CS	250cc	250cc 4-stroke overhead valve single cylinder [70mm bore x 65mm stroke]	January 1959 approvals	1960s era 250cc
1959	MATCHLESS Road Trim	250cc	250cc 4-stroke overhead valve single cylinder [70mm bore x 65mm stroke]	January 1959 approvals	1960s era 250cc
1959	MATCHLESS G12 Clubman	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.35mm stroke]	January 1959 approvals	Hot Rod Multis
1959	MATCHLESS G12 Hurricane	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.35mm stroke]	January 1959 approvals	Hot Rod Multis
1960	MATCHLESS G12 Trailblazer	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.3mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1960	MATCHLESS G12CSR Apache	650cc	646cc 4-stroke overhead valve twin cylinder [72mm bore x 79.3mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1960	MATCHLESS G80CS Westerner	500cc	497cc 4-stroke overhead valve single cylinder [86mm bore x 85.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	MATCHLESS G80CS Woodsman	500cc	497cc 4-stroke overhead valve single cylinder [86mm bore x 85.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	MATCHLESS G80TCS Typhoon	600cc	596cc 4-stroke overhead valve single cylinder [88.9mm bore x 96mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1960	MATCHLESS G9CS Tomahawk	500cc	496cc 4-stroke overhead valve twin cylinder [66mm bore x 72.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	MATCHLESS Pinto G1	175cc	170cc 2-stroke air-cooled single cylinder [62.69mm bore x 55mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	MATCHLESS G50CSR	500cc	496cc 4-stroke overhead cam single cylinder [90mm bore x 78mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1969	MB 100 SCRF	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1969	MB XC 100 SCR	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1958	MONTESA BR10-91	125cc	125cc 2-stroke single cylinder [51.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	MONTESA BR10-110	125cc	125cc 2-stroke single cylinder [51.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	MONTESA Impala Scrambler	175cc	175cc 2-stroke single cylinder [60.9mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	MONTESA Impala Sport	175cc	175cc 2-stroke single cylinder [60.9mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	MONTESA MotoX Scrambler	250cc	248cc 2-stroke single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	MONTESA Impala	250cc	248cc 2-stroke single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	MONTESA LaCross	250cc	248cc 2-stroke single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	MONTESA Scorpion	250cc	248cc 2-stroke single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1972	MONTESA 125 Cappra MX 18M	125cc	125cc 2-stroke single cylinder [51.5mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	MONTESA 250 Cappra MX-63M	250cc	248cc 2-stroke single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	MONTESA 250 King Scorpion 34M	250cc	248cc 2-stroke air-cooled single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	MONTESA Cota 123-28M	125cc	124cc 2-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	MONTESA Cota 247-21M	250cc	248cc 2-stroke single cylinder [72.5mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	MONTESA 250 Automix King Scorpion-44M	250cc	246cc 2-stroke air-cooled single cylinder [70mm bore x 64mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1973	MONTESA 250 Cappra VR-73M	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1976	MONTESA 360VA	360cc	350cc 2-stroke single cylinder [83.5mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1970s era 360cc
1952	MOTO GUZZI Falcone	500cc	499cc 4-stroke overhead valve single cylinder [88mm bore x 82mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1953	MOTO GUZZI Astore	500cc	499cc 4-stroke overhead valve single cylinder [88mm bore x 82mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	MOTO GUZZI Lodola Sport	175cc	175cc 4-stroke overhead cam single cylinder [62mm bore x 57.8mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1970	MOTO GUZZI Ambassador 750	750cc	758cc 4-stroke overhead valve twin cylinder [83mm bore x 70mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1976	MOTO GUZZI 850 Le Mans	1000cc	844cc 4-stroke overhead valve twin cylinder [83mm bore x 78mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1978	MOTO GUZZI 850 Le Mans	1000cc	844cc 4-stroke twin cylinder [83mm bore x 78mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1985	MOTO GUZZI 1000 Le Mans	1000cc	948cc 4-stroke twin cylinder [88mm bore x 78mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1965	MOTO MORINI DD	100cc	98cc 4-stroke overhead valve single cylinder [50mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	MOTO MORINI EV	125cc	123cc 4-stroke overhead valve single cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	MOTO MORINI PT Corsarino	175cc	143cc 4-stroke overhead valve single cylinder [58mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	MOTO MORINI Scrambler	125cc	123cc 4-stroke overhead valve single cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	MOTO MORINI Z	80cc	61cc 4-stroke overhead valve single cylinder [44mm bore x 40mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	MOTO MORINI ZT Corsarino	80cc	66cc 4-stroke overhead valve single cylinder [46mm bore x 40mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	MOTO MORINI ZZ	80cc	61cc 4-stroke overhead valve single cylinder [44mm bore x 40mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	MOTO MORINI Tornado	250cc	247cc 4-stroke overhead valve single cylinder [69mm bore x 66mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	MOTO MORINI Typhoon	250cc	247cc 4-stroke overhead valve single cylinder [69mm bore x 66mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1980	MOTO MORINI 500	500cc	478cc 4-stroke twin cylinder [69mm bore x 64mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1975	MOTO VILLA FV CR250	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1975	MOTO VILLA FV CR360	360cc	326cc 2-stroke single cylinder [80.5mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1970s era 360cc
1976	MOTO VILLA 450	500cc	448cc 2-stroke single cylinder [85mm bore x 79mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1960	MOTOBI Catria	175cc	172cc 4-stroke overhead valve single cylinder [62mm bore x 57mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	MOTOBI Catria Sport	125cc	124cc 4-stroke overhead valve single cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1963	MOTOBI Sprite	250cc	198cc 4-stroke overhead valve single cylinder [66.5mm bore x 57mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	MOTOM -	50cc	51cc 4-stroke overhead valve single cylinder [40.2mm bore x 40mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1952	MUSTANG Catalina	360cc	319cc 4-stroke side valve single cylinder [73mm bore x 76.2mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1952	MUSTANG Special	360cc	319cc 4-stroke side valve single cylinder [73mm bore x 76.2mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1949	NORTON 18	500cc	490cc 4-stroke overhead valve single cylinder [79mm bore x 100mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON 16H	500cc	490cc 4-stroke side valve single cylinder [79mm bore x 100mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON 30 International	500cc	490cc 4-stroke overhead cam single cylinder [79mm bore x 100mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON 30 Manx	500cc	498cc 4-stroke overhead cam single cylinder [79.62mm bore x 100mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON 40 International	360cc	348cc 4-stroke overhead cam single cylinder [71mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON 40 Manx	360cc	348cc 4-stroke overhead cam single cylinder [71mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON 7 Dominator	500cc	496cc 4-stroke overhead valve twin cylinder [66mm bore x 72.6mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON Big 4	600cc	597cc 4-stroke side valve single cylinder [82mm bore x 113mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	NORTON ES2	500cc	490cc 4-stroke overhead valve single cylinder [79mm bore x 100mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1953	NORTON 500T	500cc	490cc 4-stroke overhead valve single cylinder [79mm bore x 100mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1953	NORTON 88 Dominator	500cc	496cc 4-stroke overhead valve twin cylinder [66mm bore x 72.6mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	NORTON 99	600cc	596cc 4-stroke overhead valve twin cylinder [68mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	NORTON Jubilee	250cc	248cc 4-stroke overhead valve twin cylinder [60mm bore x 44mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	NORTON Nomad	600cc	596cc 4-stroke overhead valve twin cylinder [68mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1961	NORTON Manxman	650cc	646cc 4-stroke overhead valve twin cylinder [68mm bore x 89mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1962	NORTON 88SS	500cc	496cc 4-stroke overhead valve twin cylinder [66mm bore x 72.6mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1962	NORTON Atlas	750cc	744cc 4-stroke overhead valve twin cylinder [73mm bore x 89mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1964	NORTON Scrambler	750cc	744cc 4-stroke overhead valve twin cylinder [73mm bore x 89mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1967	NORTON P11	750cc	744cc 4-stroke overhead valve twin cylinder [73mm bore x 89mm stroke]	Bulletin #61 5/15/1968	Hot Rod Multis
1969	NORTON Commando	750cc	744cc 4-stroke overhead valve twin cylinder [73mm bore x 89mm stroke]	Bulletin #61 3/1/1969	1970s era 750cc
1971	NORTON Commando "S"	750cc	744cc 4-stroke overhead valve twin cylinder [73mm bore x 89mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1974	NORTON Commando Short Stroke	750cc	748cc 4-stroke twin cylinder [77mm bore x 80.4mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1971	NORTON-AJS Y40	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1951	NSU Consul II	500cc	498cc 4-stroke overhead valve single cylinder [80mm bore x 99mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1957	NSU Maxi	175cc	175cc 4-stroke overhead cam single cylinder [62mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1957	NSU Super Max	250cc	247cc 4-stroke overhead cam single cylinder [69mm bore x 66mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	NSU Maxi	175cc	175cc 4-stroke overhead cam single cylinder [62mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	NSU S20 Super Max	250cc	247cc 4-stroke overhead cam single cylinder [69mm bore x 66mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	NSU S20 Super Maxi	250cc	247cc 4-stroke overhead cam single cylinder [69mm bore x 66mm stroke]	January 1959 approvals	1960s era 250cc
1959	NSU Scrambler	250cc	247cc 4-stroke overhead cam single cylinder [69mm bore x 66mm stroke]	January 1959 approvals	1960s era 250cc
1966	OSSA SE	175cc	175cc 2-stroke single cylinder [60.9mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	OSSA Scrambler	250cc	231cc 2-stroke single cylinder [70mm bore x 60mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1969	OSSA Pioneer M25	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	OSSA Stiletto M26	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1971	OSSA Pioneer	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	OSSA Stilleto (used in the DMR)	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1974	OSSA Phantom 250MX	250cc	244cc 2-stroke air-cooled single cylinder [72mm bore x 60mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1977	OSSA GPIII	250cc	244cc 2-stroke single cylinder [72mm bore x 60mm stroke]	Bulletin #61 10/31/1977	1980s era 250cc
1961	PANNONIA TLF Standard	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1949	PANTHER 65	250cc	249cc 4-stroke overhead valve single cylinder [60mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	PANTHER 75	360cc	348cc 4-stroke overhead valve single cylinder [71mm bore x 88mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	PANTHER 100	600cc	594cc 4-stroke overhead valve single cylinder [87mm bore x 100mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1958	PARILLA Clipper	360cc	350cc 4-stroke overhead valve twin cylinder [62mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1958	PARILLA Grand Sport	175cc	174cc 4-stroke overhead valve single cylinder [59.8mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	PARILLA Phantom	100cc	98cc 4-stroke overhead valve single cylinder [50mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	PARILLA Speedster	175cc	174cc 4-stroke overhead valve single cylinder [59.8mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	PARILLA Wildcat Scrambler	175cc	174cc 4-stroke overhead valve single cylinder [59.8mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	PARILLA Antelope Scrambler	125cc	124cc 4-stroke overhead valve single cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	PARILLA Hornet	50cc	49cc 4-stroke overhead valve single cylinder [40mm bore x 39mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	PARILLA MotoX	175cc	142cc 4-stroke overhead valve single cylinder [54mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	PARILLA Ramjet	100cc	98cc 4-stroke overhead valve single cylinder [52mm bore x 46mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	PARILLA Road Model	175cc	142cc 4-stroke overhead valve single cylinder [54mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	PARILLA Vanguard	125cc	124cc 4-stroke overhead valve single cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	PARILLA Road	125cc	124cc 4-stroke overhead valve single cylinder [54mm bore x 54mm stroke]	January 1959 approvals	1960s era 250cc
1959	PARILLA MotoX	125cc	124cc 4-stroke overhead valve single cylinder [54mm bore x 54mm stroke]	January 1959 approvals	1960s era 250cc
1960	PARILLA Impala	175cc	175cc 4-stroke overhead valve single cylinder [62mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	PARILLA Grand Sport	250cc	199cc 4-stroke overhead valve single cylinder [64mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	PARILLA Scrambler	250cc	247cc 4-stroke overhead valve single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	PARILLA Speedster	250cc	199cc 4-stroke overhead valve single cylinder [64mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	PARILLA Trailmaster	250cc	247cc 4-stroke overhead valve single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	PARILLA Grand Sport	125cc	124cc 4-stroke overhead valve single cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	PARILLA Olimpa	125cc	109cc 4-stroke overhead valve single cylinder [55mm bore x 46mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	PARILLA Grand Sport	250cc	247cc 4-stroke overhead valve single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1972	PENTON 125	125cc	124cc 2-stroke single cylinder [54mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	PENTON 175	175cc	171cc 2-stroke single cylinder [63.5mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1974	PENTON Mint 400	360cc	356cc 2-stroke single cylinder [81mm bore x 69mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1973	PENTON-KTM 250cc	250cc	245cc 2-stroke single cylinder [71mm bore x 62mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1974	POWER-DYNE 360 Gringo	360cc	352cc 2-stroke air-cooled single cylinder [80mm bore x 70mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1972	ROKON RT 340	360cc	334cc 2-stroke single cylinder [78mm bore x 70mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1950	ROYAL ENFIELD Bullet	360cc	346cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ROYAL ENFIELD Bullet Scrambler	360cc	346cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ROYAL ENFIELD G	360cc	346cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ROYAL ENFIELD J2	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ROYAL ENFIELD RE	125cc	125cc 2-stroke air-cooled single cylinder [53.79mm bore x 55mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1950	ROYAL ENFIELD S51	250cc	248cc 4-stroke overhead valve single cylinder [64mm bore x 77mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	ROYAL ENFIELD Twin	500cc	496cc 4-stroke overhead valve twin cylinder [64mm bore x 77mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1954	ROYAL ENFIELD Bullet Scrambler	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	ROYAL ENFIELD Scrambler	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	January 1959 approvals	1960s era 750cc
1950	ROYAL ENFIELD Trials	360cc	346cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	January 1959 approvals	1940s era 750cc
1960	ROYAL ENFIELD Constellation	750cc	692cc 4-stroke overhead valve twin cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1960	ROYAL ENFIELD Crusader	250cc	248cc 4-stroke overhead valve single cylinder [69.9mm bore x 64.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1960	ROYAL ENFIELD Fury Scrambler	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	ROYAL ENFIELD Fury Scrambler	360cc	346cc 4-stroke overhead valve single cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	ROYAL ENFIELD Intercepter	750cc	692cc 4-stroke overhead valve twin cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1960	ROYAL ENFIELD Meteor Minor Twin	500cc	496cc 4-stroke overhead valve twin cylinder [64mm bore x 77mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	ROYAL ENFIELD Scrambler	250cc	248cc 4-stroke overhead valve single cylinder [69.9mm bore x 64.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1960	ROYAL ENFIELD Super Meteor	750cc	692cc 4-stroke overhead valve twin cylinder [70mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1961	ROYAL ENFIELD Fury F6	600cc	597cc 4-stroke overhead valve single cylinder [86mm bore x 102.7mm stroke]	Bulletin #61 5/15/1967	Hot Rod Singles
1962	ROYAL ENFIELD Crusader Super 5	250cc	248cc 4-stroke overhead valve single cylinder [70mm bore x 64.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1962	ROYAL ENFIELD Intercepter	750cc	736cc 4-stroke overhead valve twin cylinder [71mm bore x 93mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	RUMI Junior	125cc	124cc 2-stroke twin cylinder [42mm bore x 45mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	SUZUKI 80K	80cc	80cc 2-stroke single cylinder [45mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	SUZUKI K11	80cc	80cc 2-stroke single cylinder [45mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	SUZUKI M12	50cc	50cc 2-stroke single cylinder [41mm bore x 38mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	SUZUKI S31	125cc	124cc 2-stroke twin cylinder [42mm bore x 45mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	SUZUKI SKB	175cc	150cc 2-stroke twin cylinder [46mm bore x 45mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	SUZUKI T10	250cc	246cc 2-stroke twin cylinder [52mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	SUZUKI K15	80cc	80cc 2-stroke single cylinder [45mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	SUZUKI T20 Hustler	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	SUZUKI X6 Hustler	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1968	SUZUKI T500/5	500cc	492cc 2-stroke twin cylinder [70mm bore x 64mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1969	SUZUKI AC100	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	SUZUKI AS50	50cc	50cc 2-stroke single cylinder [41.1mm bore x 37.8mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	SUZUKI T125	125cc	124cc 2-stroke twin cylinder [42.9mm bore x 42.9mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1969	SUZUKI TC120	125cc	119cc 2-stroke single cylinder [52.1mm bore x 55.9mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	SUZUKI TR250	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1969	SUZUKI TR350	360cc	316cc 2-stroke twin cylinder [61mm bore x 54mm stroke]	Bulletin #61 3/1/1969	1970s era 750cc
1969	SUZUKI TR500	500cc	492cc 2-stroke twin cylinder [70mm bore x 64mm stroke]	Bulletin #61 3/1/1969	1970s era 750cc
1969	SUZUKI TS250	250cc	247cc 2-stroke air-cooled single cylinder [70.1mm bore x 64mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1970	SUZUKI TC90	100cc	90cc 2-stroke single cylinder [47mm bore x 51.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	SUZUKI TS90	100cc	90cc 2-stroke single cylinder [47mm bore x 51.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	SUZUKI TM400R	500cc	396cc 2-stroke single cylinder [82mm bore x 74.9mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	SUZUKI TS125R	125cc	123cc 2-stroke single cylinder [55.9mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	SUZUKI TS185R	250cc	183cc 2-stroke single cylinder [64mm bore x 56.9mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	SUZUKI GT380J	360cc	372cc 2-stroke three cylinder [54.1mm bore x 54.1mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	SUZUKI GT550J	560cc	543cc 2-stroke three cylinder [61mm bore x 62mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	SUZUKI GT750J	750cc	741cc 2-stroke three cylinder [70.1mm bore x 64mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	SUZUKI RV90J	100cc	88cc 2-stroke single cylinder [50mm bore x 45mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1972	SUZUKI TC125J	125cc	123cc 2-stroke single cylinder [55.9mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	SUZUKI TM250J	250cc	247cc 2-stroke single cylinder [70.1mm bore x 64mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	SUZUKI TS400J	500cc	396cc 2-stroke single cylinder [82mm bore x 74.9mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	SUZUKI GT185	250cc	184cc 2-stroke twin cylinder [47mm bore x 53.1mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1973	SUZUKI GT250	250cc	248cc 2-stroke twin cylinder [54.1mm bore x 54.1mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1973	SUZUKI RV125	125cc	123cc 2-stroke single cylinder [55.9mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	SUZUKI TC100	100cc	98cc 2-stroke single cylinder [49mm bore x 51.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	SUZUKI TM125	125cc	123cc 2-stroke single cylinder [55.9mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1973	SUZUKI TS100	100cc	98cc 2-stroke single cylinder [49mm bore x 51.8mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1974	SUZUKI TM100	100cc	98cc 2-stroke single cylinder [50mm bore x 50mm stroke]	Bulletin #61 8/5/1975	1970s era 250cc
1974	SUZUKI TM75	80cc	73cc 2-stroke air-cooled single cylinder [47mm bore x 42mm stroke]	Bulletin #61 9/18/1974	1970s era 250cc
1975	SUZUKI GT750S	750cc	738cc 2-stroke water-cooled three cylinder [70mm bore x 64mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1976	SUZUKI RM250A	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1976	SUZUKI RM250B	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1976	SUZUKI RM250C	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1976	SUZUKI RM370A	360cc	373cc 2-stroke single cylinder [77mm bore x 80mm stroke]	Bulletin #61 6/20/1978	1970s era 750cc
1976	SUZUKI RM370B	360cc	373cc 2-stroke single cylinder [77mm bore x 80mm stroke]	Bulletin #61 6/20/1978	1970s era 750cc
1977	SUZUKI GS400B	500cc	398cc 4-stroke twin cylinder [65mm bore x 60mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1977	SUZUKI GS400XB	500cc	398cc 4-stroke twin cylinder [65mm bore x 60mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1977	SUZUKI GS550B	560cc	548cc 4-stroke four cylinder [56mm bore x 55.8mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1977	SUZUKI GS750B	750cc	748cc 4-stroke four cylinder [65mm bore x 56.4mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1978	SUZUKI GS1000C	1000cc	984cc 4-stroke four cylinder [70mm bore x 64mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1978	SUZUKI GS1000EC	1000cc	996cc 4-stroke water-cooled four cylinder [70mm bore x 64.8mm stroke]	Bulletin #61B, 6/22/1989	Hot Rod Multis
1978	SUZUKI GS550	560cc	548cc 4-stroke four cylinder [56mm bore x 55.8mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1978	SUZUKI GS750C	750cc	748cc 4-stroke four cylinder [65mm bore x 56.4mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1978	SUZUKI GS750EC	750cc	748cc 4-stroke four cylinder [65mm bore x 56.4mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1978	SUZUKI RM400C	500cc	402cc 2-stroke single cylinder [80mm bore x 80mm stroke]	Bulletin #61 6/20/1978	1980s era 750cc
1979	SUZUKI GS1000S	1000cc	996cc 4-stroke four cylinder [70mm bore x 64.8mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1979	SUZUKI RM250N	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1979	SUZUKI RM400N	500cc	417cc 2-stroke single cylinder [80mm bore x 83mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1980	SUZUKI GS750ET	750cc	748cc 4-stroke four cylinder [67mm bore x 53mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1980	SUZUKI PE250T	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1981	SUZUKI DR500X	500cc	499cc 4-stroke single cylinder [88mm bore x 82mm stroke]	Bulletin #61 6/22/1989	1980s era 500cc
1981	SUZUKI PE250X	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1982	SUZUKI GS1000SZ	1000cc	1000cc 4-stroke four cylinder [69.4mm bore x 66mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1983	SUZUKI GS750ED	750cc	748cc 4-stroke four cylinder [67mm bore x 53mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1983	SUZUKI GS750ESD	750cc	748cc 4-stroke four cylinder [67mm bore x 53mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1983	SUZUKI GS750SD	750cc	748cc 4-stroke four cylinder [67mm bore x 53mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1984	SUZUKI RM500E	500cc	492cc 2-stroke single cylinder [88.5mm bore x 80mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1985	SUZUKI GS700E	750cc	700cc 4-stroke four cylinder [67mm bore x 49.6mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1985	SUZUKI GS700ESF	750cc	700cc 4-stroke four cylinder [67mm bore x 49.6mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1985	SUZUKI RM125F	125cc	124cc 2-stroke water-cooled single cylinder [54mm bore x 54mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	SUZUKI RM250F	250cc	246cc 2-stroke water-cooled single cylinder [70mm bore x 64mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	SUZUKI SP600F	600cc	590cc 4-stroke single cylinder [94mm bore x 85mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	SUZUKI GSXR750G	750cc	748cc 4-stroke four cylinder [70mm bore x 48.7mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1986	SUZUKI RM125G	125cc	124cc 2-stroke water-cooled single cylinder [54mm bore x 54mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	SUZUKI RM250G	250cc	247cc 2-stroke water-cooled single cylinder [67mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	SUZUKI RM125H	125cc	124cc 2-stroke water-cooled single cylinder [54mm bore x 54mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	SUZUKI RM250H	250cc	247cc 2-stroke water-cooled single cylinder [67mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1988	SUZUKI GSX600FJ	600cc	592cc 4-stroke four cylinder [62.2mm bore x 48.7mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1988	SUZUKI GSXR750J	1000cc	816cc 4-stroke four cylinder [73mm bore x 48.7mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1988	SUZUKI RM125J	125cc	124cc 2-stroke water-cooled single cylinder [54mm bore x 54mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1988	SUZUKI RM250J	250cc	247cc 2-stroke water-cooled single cylinder [67mm bore x 70mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1980	SWM RS250MC TF1	250cc	248cc 2-stroke single cylinder [72mm bore x 61mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1961	TOHATSU CA	50cc	49cc 2-stroke single cylinder [40mm bore x 39mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	TOHATSU CA2	50cc	49cc 2-stroke single cylinder [40mm bore x 39mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	TOHATSU LD2	125cc	124cc 2-stroke twin cylinder [43mm bore x 43mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	TOHATSU LD3	125cc	124cc 2-stroke twin cylinder [43mm bore x 43mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1949	TRIUMPH 3T	360cc	348cc 4-stroke overhead valve twin cylinder [55mm bore x 73.4mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	TRIUMPH 5T Speed Twin	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	TRIUMPH Grand Prix	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	TRIUMPH T100 Tiger	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1949	TRIUMPH TR5 Trophy	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	TRIUMPH 6T Thunderbird	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1952	TRIUMPH T100 Tiger	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1953	TRIUMPH T15 Terrier	175cc	149cc 4-stroke overhead valve single cylinder [57mm bore x 58.5mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1954	TRIUMPH Tiger Cub	250cc	200cc 4-stroke overhead valve single cylinder [63mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1955	TRIUMPH T100R	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1956	TRIUMPH TR5R	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	TRIUMPH T100R/R	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	TRIUMPH T100RS	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1957	TRIUMPH T20C Cub	250cc	200cc 4-stroke overhead valve single cylinder [63mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1958	TRIUMPH 21	360cc	350cc 4-stroke overhead valve twin cylinder [58.25mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	TRIUMPH 3TA "21"	360cc	350cc 4-stroke overhead valve twin cylinder [58.25mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	TRIUMPH 5TA Speed Twin	500cc	490cc 4-stroke overhead valve twin cylinder [69mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	TRIUMPH T110 Tiger	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	TRIUMPH T120	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	TRIUMPH T20 Road Model	250cc	200cc 4-stroke overhead valve single cylinder [63mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	TRIUMPH T20C Tiger Cub	250cc	200cc 4-stroke overhead valve single cylinder [63mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	TRIUMPH T20CA	250cc	200cc 4-stroke overhead valve single cylinder [63mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	TRIUMPH T20S	250cc	200cc 4-stroke overhead valve single cylinder [63mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	TRIUMPH TR6B	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1959	TRIUMPH T100C Tiger	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	January 1959 approvals	1960s era 750cc
1959	TRIUMPH T100RR	500cc	498cc 4-stroke overhead valve twin cylinder [63mm bore x 80mm stroke]	January 1959 approvals	1960s era 750cc
1959	TRIUMPH T110	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	January 1959 approvals	Hot Rod Multis
1960	TRIUMPH 5TA Speed Twin	500cc	490cc 4-stroke overhead valve twin cylinder [69mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	TRIUMPH T100A Tiger	500cc	490cc 4-stroke overhead valve twin cylinder [69mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1960	TRIUMPH T110 Tiger	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1960	TRIUMPH T120 Bonneville	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1960	TRIUMPH TR7A Bonneville	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1961	TRIUMPH T120R	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1961	TRIUMPH T20SL	250cc	200cc 4-stroke overhead valve single cylinder [63mm bore x 64mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	TRIUMPH TR5AC	500cc	490cc 4-stroke overhead valve twin cylinder [69mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1961	TRIUMPH TR5AR	500cc	490cc 4-stroke overhead valve twin cylinder [69mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1963	TRIUMPH T120C	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1963	TRIUMPH T120R	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1963	TRIUMPH TR6C	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1963	TRIUMPH TR6R	650cc	650cc 4-stroke overhead valve twin cylinder [71mm bore x 82mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1967	TRIUMPH T100R	500cc	490cc 4-stroke overhead valve twin cylinder [69mm bore x 65.5mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1968	TRIUMPH TR25W	250cc	247cc 4-stroke overhead valve single cylinder [67mm bore x 70mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	TRIUMPH TR25W	360cc	343cc 4-stroke single cylinder [79mm bore x 70mm stroke]	Bulletin #61 8/5/1975	1960s era 750cc
1968	TRIUMPH TR25W	360cc	352cc 4-stroke single cylinder [80mm bore x 70mm stroke]	Bulletin #61 8/5/1975	1960s era 750cc
1968	TRIUMPH TR25W	360cc	356cc 4-stroke single cylinder [80.5mm bore x 70mm stroke]	Bulletin #61 8/5/1975	1960s era 750cc
1969	TRIUMPH T150 / Trident	750cc	741cc 4-stroke overhead valve three cylinder [67mm bore x 70mm stroke] four speed	Bulletin #61 3/1/1969	1970s era 750cc
1971	TRIUMPH Trident T150V / Trident	750cc	741cc 4-stroke three cylinder [67mm bore x 70mm stroke] five speed	Bulletin #61 10/2/1973	1970s era 750cc
1970	TRIUMPH T120/RT	750cc	744cc 4-stroke twin cylinder [76mm bore x 82mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	TRIUMPH T140V (aka "short rod")	750cc	744cc 4-stroke twin cylinder [76mm bore x 82mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	TRIUMPH TR7 RV Tiger	750cc	744cc 4-stroke overhead valve twin cylinder [76mm bore x 82mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	TRIUMPH TRX-75V	750cc	741cc 4-stroke three cylinder [67mm bore x 70mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1979	TRIUMPH T140EUK	750cc	744cc 4-stroke twin cylinder [76mm bore x 82mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1951	TWN BDG	125cc	122cc 2-stroke air-cooled split single [2X 35.5mm bore x 62mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1958	TWN BDGSL	125cc	128cc 2-stroke air-cooled split single [2X 35.5mm bore x 65mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	TWN BDG-SL	125cc	128cc 2-stroke air-cooled split single [2X 35.5mm bore x 65mm stroke]	January 1959 approvals	1960s era 250cc
1951	VELOCETTE MAC	360cc	349cc 4-stroke overhead valve single cylinder [68mm bore x 96mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1951	VELOCETTE MOV	250cc	248cc 4-stroke overhead valve single cylinder [68mm bore x 68.25mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1951	VELOCETTE MSS	500cc	495cc 4-stroke overhead valve single cylinder [81mm bore x 96mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1953	VELOCETTE MAC	360cc	349cc 4-stroke overhead valve single cylinder [68mm bore x 96mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1954	VELOCETTE MSS	500cc	495cc 4-stroke overhead valve single cylinder [81mm bore x 96mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1962	VELOCETTE MSS Scrambler	500cc	500cc 4-stroke overhead valve single cylinder [86mm bore x 86mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1962	VELOCETTE VM Endurance	500cc	500cc 4-stroke overhead valve single cylinder [86mm bore x 86mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1964	VELOCETTE Endro	500cc	500cc 4-stroke overhead valve single cylinder [86mm bore x 86mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1964	VELOCETTE MSS	500cc	500cc 4-stroke overhead valve single cylinder [86mm bore x 86mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1964	VELOCETTE Vee	500cc	500cc 4-stroke overhead valve single cylinder [86mm bore x 86mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1964	VELOCETTE Venom Clubman	500cc	500cc 4-stroke overhead valve single cylinder [86mm bore x 86mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1967	VELOCETTE Thruxton	500cc	500cc 4-stroke overhead valve single cylinder [86mm bore x 86mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1950	VINCENT Comet	500cc	499cc 4-stroke overhead valve single cylinder [84mm bore x 90mm stroke]	Bulletin #61 5/15/1967	1940s era 750cc
1950	VINCENT Shadow	1000cc	998cc 4-stroke overhead valve twin cylinder [84mm bore x 90mm stroke]	Bulletin #61 5/15/1967	Hot Rod Multis
1967	WHITE Mark I	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1983	WOOD-ROTAX Newport 500	500cc	494cc 4-stroke air-cooled overhead cam single cylinder [89mm bore x 79.4mm stroke]	Bulletin #61 6/22/1989	1980s era 500cc
1984	WOOD-ROTAX Newport 560	560cc	562cc 4-stroke air-cooled overhead cam single cylinder [94mm bore x 81mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1985	WOOD-ROTAX Newport 660	660cc	657cc 4-stroke air-cooled overhead cam single cylinder [101.6mm bore x 81mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	WOOD-ROTAX 600	600cc	599cc 4-stroke air-cooled overhead cam single cylinder [97mm bore x 81mm stroke]	n/a	1980s era 750cc
1986	WOOD-ROTAX 614	600cc	611cc 4-stroke air-cooled overhead cam single cylinder [99mm bore x 79.4mm stroke]	n/a	1980s era 750cc
1986	WOOD-ROTAX 676	660cc	675cc 4-stroke air-cooled overhead cam single cylinder [103mm bore x 81mm stroke]	n/a	1980s era 750cc
1991	WOOD-ROTAX 605	600cc	599cc 4-stroke water-cooled DOHC single [97mm bore x 81mm stroke]	n/a	1990s era 1000cc
1959	YAMAHA YA Road Model	125cc	123cc 2-stroke single cylinder [52mm bore x 58mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	YAMAHA YDS Road Model	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1960	YAMAHA YDS Road Model	250cc	246cc 2-stroke air-cooled twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1960	YAMAHA YDS Road Racer	250cc	246cc 2-stroke air-cooled twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1960	YAMAHA YDS Scrambler	250cc	246cc 2-stroke air-cooled twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1961	YAMAHA TD1 (YDS1)	250cc	246cc 2-stroke air-cooled twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	YAMAHA TD1A (YDS1)	250cc	246cc 2-stroke twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	YAMAHA YG1 Street	80cc	73cc 2-stroke single cylinder [47mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1964	YAMAHA YG1 Trail	80cc	73cc 2-stroke single cylinder [47mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA TD1B (YDS3 / YDS3C)	250cc	246cc 2-stroke twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA YA6	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA YD3	250cc	246cc 2-stroke twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA YG1 Street	80cc	73cc 2-stroke single cylinder [47mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA YG1 Trail	80cc	73cc 2-stroke single cylinder [47mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA YGS1	80cc	73cc 2-stroke single cylinder [47mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA YJ1	80cc	55cc 2-stroke single cylinder [42mm bore x 40mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1965	YAMAHA YM1	360cc	306cc 2-stroke twin cylinder [60mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1966	YAMAHA 50U5	50cc	50cc 2-stroke single cylinder [40mm bore x 40mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	YAMAHA YA7	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	YAMAHA YJ2	80cc	58cc 2-stroke single cylinder [42mm bore x 42mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1966	YAMAHA YL1	100cc	98cc 2-stroke twin cylinder [38mm bore x 43mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	YAMAHA TD1C (YDS5)	250cc	246cc 2-stroke twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	YAMAHA YCS1	250cc	180cc 2-stroke twin cylinder [50mm bore x 46mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	YAMAHA YL1E	100cc	98cc 2-stroke twin cylinder [38mm bore x 43mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	YAMAHA YL2	100cc	97cc 2-stroke single cylinder [52mm bore x 45.6mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	YAMAHA YL2C	100cc	97cc 2-stroke single cylinder [52mm bore x 45.6mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1967	YAMAHA YM2C	360cc	306cc 2-stroke twin cylinder [60mm bore x 54mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1967	YAMAHA YR1	360cc	348cc 2-stroke twin cylinder [61mm bore x 59.6mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1968	YAMAHA AS1	125cc	124cc 2-stroke twin cylinder [43mm bore x 43mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	YAMAHA CS1	250cc	180cc 2-stroke twin cylinder [50mm bore x 46mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	YAMAHA DT1	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	YAMAHA YG5T	80cc	73cc 2-stroke single cylinder [47mm bore x 42mm stroke]	Bulletin #61 5/15/1968	1960s era 250cc
1968	YAMAHA YR2	360cc	348cc 2-stroke twin cylinder [61mm bore x 59.6mm stroke]	Bulletin #61 5/15/1968	1960s era 750cc
1969	YAMAHA 65-5	80cc	73cc 2-stroke single cylinder [47mm bore x 42mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	YAMAHA AS2C	125cc	124cc 2-stroke twin cylinder [43mm bore x 43mm stroke]	Bulletin #61 3/1/1969	1970s era 360cc
1969	YAMAHA AT1	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	YAMAHA DT1	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	YAMAHA L5T	100cc	97cc 2-stroke single cylinder [52mm bore x 45.6mm stroke]	Bulletin #61 3/1/1969	1970s era 250cc
1969	YAMAHA R3	360cc	348cc 2-stroke twin cylinder [61mm bore x 59.6mm stroke]	Bulletin #61 3/1/1969	1970s era 750cc
1969	YAMAHA TD2 (DS6 / DS6C / YDS6)	250cc	246cc 2-stroke air-cooled twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1969	YAMAHA TR2	360cc	348cc 2-stroke twin cylinder [61mm bore x 59.6mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1969	YAMAHA TR2V	360cc	348cc 2-stroke twin cylinder [61mm bore x 59.6mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1970	YAMAHA AT1B	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	YAMAHA CS3C	250cc	196cc 2-stroke twin cylinder [52mm bore x 46mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1970	YAMAHA CT1B	175cc	171cc 2-stroke single cylinder [66mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	YAMAHA L5TA	100cc	97cc 2-stroke single cylinder [52mm bore x 45.6mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1970	YAMAHA XS650	650cc	654cc 4-stroke twin cylinder [75mm bore x 74mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	YAMAHA DT1E	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1971	YAMAHA GXS-1 (XS650 Modified)	750cc	744cc 4-stroke twin cylinder [80mm bore x 74mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	YAMAHA R5	360cc	348cc 2-stroke twin cylinder [64mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	YAMAHA R5B	360cc	348cc 2-stroke twin cylinder [64mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1971	YAMAHA RT1	360cc	352cc 2-stroke single cylinder [80mm bore x 70mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1971	YAMAHA TD2B (YDS6)	250cc	246cc 2-stroke twin cylinder [56mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1971	YAMAHA TR3	360cc	348cc 2-stroke twin cylinder [64mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	YAMAHA AT2	125cc	123cc 2-stroke single cylinder [56mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	YAMAHA CT2	175cc	171cc 2-stroke single cylinder [66mm bore x 50mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	YAMAHA DT2	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	YAMAHA LS2	100cc	98cc 2-stroke twin cylinder [38mm bore x 43mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1972	YAMAHA LT2	100cc	97cc 2-stroke single cylinder [52mm bore x 45.6mm stroke]	Bulletin #61 10/2/1973	1970s era 250cc
1972	YAMAHA R5X	360cc	348cc 2-stroke twin cylinder [64mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1972	YAMAHA RT2	360cc	352cc 2-stroke single cylinder [80mm bore x 70mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1972	YAMAHA TD3 (DS7 / YDS7)	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1972	YAMAHA XS2	650cc	654cc 4-stroke twin cylinder [75mm bore x 74mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1973	YAMAHA MX360	360cc	352cc 2-stroke single cylinder [80mm bore x 70mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1973	YAMAHA TA125	125cc	124cc 2-stroke twin cylinder [43mm bore x 43mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1973	YAMAHA TA250	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 360cc
1973	YAMAHA TZ350	360cc	348cc 2-stroke water-cooled twin cylinder [64mm bore x 54mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1974	YAMAHA SC500A	500cc	496cc 2-stroke air-cooled single cylinder [95mm bore x 70mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1974	YAMAHA TX500A	500cc	498cc 4-stroke air-cooled twin cylinder [73mm bore x 59.6mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1974	YAMAHA TX750A	750cc	744cc 4-stroke twin cylinder [80mm bore x 74mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1974	YAMAHA TZ250A	250cc	248cc 2-stroke water-cooled twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 9/18/1974	1970s era 360cc
1974	YAMAHA TZ750A	750cc	696cc 2-stroke water-cooled four cylinder [64mm bore x 54mm stroke]	Bulletin #61 9/18/1974	1970s era 750cc
1975	YAMAHA TZ750B	750cc	748cc 2-stroke water-cooled four cylinder [66.4mm bore x 54mm stroke]	Bulletin #61 8/5/1975	1970s era 750cc
1975	YAMAHA YZ360B	360cc	352cc 2-stroke air-cooled single cylinder [80mm bore x 70mm stroke]	Bulletin #61 8/5/1975	1970s era 360cc
1976	YAMAHA XS-DTC (XS650 Modified / OW72)	750cc	744cc 4-stroke air-cooled twin cylinder [80mm bore x 74mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1976	YAMAHA TT500C	500cc	499cc 4-stroke air-cooled single cylinder [87mm bore x 84mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1976	YAMAHA TZ250C	250cc	248cc 2-stroke water-cooled twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 10/31/1977	1970s era 360cc
1976	YAMAHA YZ250C	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1970s era 250cc
1976	YAMAHA YZ400C	500cc	397cc 2-stroke single cylinder [85mm bore x 70mm stroke]	Bulletin #61 10/31/1977	1970s era 750cc
1977	YAMAHA TZ250D	250cc	248cc 2-stroke twin cylinder [54mm bore x 54mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1977	YAMAHA TZ750D	750cc	748cc 2-stroke four cylinder [66.4mm bore x 54mm stroke]	Bulletin #61 10/31/1977	Hot Rod Multis
1977	YAMAHA XS750 (1J7)	750cc	747cc 4-stroke three cylinder [68mm bore x 68.6mm stroke]	Bulletin #61 6/20/1978	Hot Rod Multis
1977	YAMAHA YZ250D	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 10/31/1977	1980s era 250cc
1978	YAMAHA YZ250E	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 6/20/1978	1980s era 250cc
1980	YAMAHA IT250G (3R7)	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1980	YAMAHA IT425G (3R8)	500cc	426cc 2-stroke single cylinder [85mm bore x 75mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1980	YAMAHA TT250G (3Y0)	250cc	250cc 4-stroke single cylinder [75mm bore x 56.5mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1980	YAMAHA YZ250G (3R4)	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1980	YAMAHA YZ465G (3R5)	500cc	465cc 2-stroke single cylinder [85mm bore x 82mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1981	YAMAHA XV750	750cc	748cc 4-stroke twin cylinder [83mm bore x 69.2mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1981	YAMAHA XV920RH	1000cc	920cc 4-stroke twin cylinder [92mm bore x 69.2mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1982	YAMAHA YZ250J	250cc	246cc 2-stroke single cylinder [70mm bore x 64mm stroke]	Bulletin #61 6/4/1982	1980s era 250cc
1982	YAMAHA YZ490J	500cc	487cc 2-stroke single cylinder [87mm bore x 82mm stroke]	Bulletin #61 6/4/1982	1980s era 750cc
1983	YAMAHA TT600	600cc	595cc 4-stroke single cylinder [95mm bore x 84mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1983	YAMAHA XJ750RK	750cc	748cc 4-stroke four cylinder [65mm bore x 56.4mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1983	YAMAHA XT550K	560cc	558cc 4-stroke single cylinder [92mm bore x 84mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1983	YAMAHA YZ250K	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	YAMAHA FZ750 (IAE)	750cc	748cc 4-stroke four cylinder [68mm bore x 51.6mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1985	YAMAHA YZ125N	125cc	123cc 2-stroke water-cooled single cylinder [56mm bore x 50mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	YAMAHA YZ250N	250cc	247cc 2-stroke single cylinder [68mm bore x 68mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1985	YAMAHA YZ490N	500cc	487cc 2-stroke air-cooled single cylinder [87mm bore x 82mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1986	YAMAHA YZ125S	125cc	123cc 2-stroke water-cooled single cylinder [56mm bore x 50mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	YAMAHA YZ250S	250cc	247cc 2-stroke water-cooled single cylinder [68mm bore x 68mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1986	YAMAHA YZ490S	500cc	487cc 2-stroke air-cooled single cylinder [87mm bore x 82mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1987	YAMAHA FZR750RT	750cc	748cc 4-stroke four cylinder [68mm bore x 51.6mm stroke]	Bulletin #61 6/22/1989	Hot Rod Multis
1987	YAMAHA YZ125T	125cc	123cc 2-stroke water-cooled single cylinder [56mm bore x 50mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1987	YAMAHA YZ490T	500cc	487cc 2-stroke air-cooled single cylinder [87mm bore x 82mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1988	YAMAHA YZ125	125cc	123cc 2-stroke water-cooled single cylinder [56mm bore x 50mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1988	YAMAHA YZ250	250cc	247cc 2-stroke water-cooled single cylinder [68mm bore x 68mm stroke]	Bulletin #61 6/22/1989	1980s era 250cc
1988	YAMAHA YZ490	500cc	487cc 2-stroke air-cooled single cylinder [87mm bore x 82mm stroke]	Bulletin #61 6/22/1989	1980s era 750cc
1970	YANKEE 500Z	500cc	488cc 2-stroke twin cylinder [72mm bore x 60mm stroke]	Bulletin #61 10/2/1973	1970s era 750cc
1954	ZUNDAPP Endro	250cc	198cc 2-stroke single cylinder [60mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	ZUNDAPP Challenger	250cc	199cc 2-stroke air-cooled single cylinder [64mm bore x 62mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc
1959	ZUNDAPP Citation	500cc	452cc 4-stroke overhead cam twin cylinder [66mm bore x 66mm stroke]	Bulletin #61 5/15/1967	1960s era 750cc
1959	ZUNDAPP Super Sabre	250cc	247cc 2-stroke single cylinder [67mm bore x 70mm stroke]	Bulletin #61 5/15/1967	1960s era 250cc

Back to Top

MOTORCYCLES APPROVED FOR AMA CLASS C COMPETITION1948 to 1989

MOTORCYCLES APPROVED FOR AMA CLASS C COMPETITION
1948 to 1989