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The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power. Although other ...
[2] [3] Designed by Soichiro Miyakoshi, the prototype production machine began testing in Japan in 1971, and on California motocross tracks in 1972. [4] The CR250M was Honda's first two-stroke production race bike, the first competition dirt bike that Honda built from scratch instead of adapting a street bike, [5] and the first production ...
The KTM 300 is a series of 2-stroke enduro / off-road motorcycles made by KTM.They are the Penton-inspired 1984 300 GS, the 300 DMX, the dirt only 300 MXC, European road legal 300 EXC and the US 300 XC (close-ratio), 300 XC-W (wide-ratio gear box) and 300 SX (Motocross) versions.
The Yamaha PW50 is a commercially available two-stroke 50 cc (3.1 cu in) mini dirt bike, designed, developed and produced by Japanese manufacturer Yamaha since 1980. [ 7 ] [ 8 ] [ 9 ] References
In Australia, England, Canada, and the USA the Yamaha RD series (RD60, RD125, RD200, RD250, RD350, RD400) from which the later RZ/RD were descended, were first released in the 1970s as air-cooled two-strokes. In 1980 the bikes had a redesign using ideas Yamaha gained from two-stroke Grand Prix and production race experiences.
The Honda CR series was a line of two-stroke off-road motorcycles made by Honda from 1973 to 2007. They are racing motorcycles with countless trophies in the 125, 250 and 500 motocross classes.
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The "Pure Enduro" series of off-road racing motorcycles ran from 1977 through to 1984 in engine displacements from 175cc through 400cc. All engines were case-reed valve, air-cooled, two-stroke and single-cylinder with plain steel bores. Lubrication was provided via 20:1 pre-mix.
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