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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 Suzuki TS series is a family of two-stroke, dual-sport motorcycles made by Suzuki since 1969. The series was the first Suzuki trail bikes sold on the mass market. Most of the TS line had an air-cooled engine and most models were introduced alongside the closely related TM (Motocross) or TC (trail) models, TF (farm) and also the DS (for Dirt Sport, which had no turn signals, and simplified ...
Manufacturers kept plugging away at roughly the same recipe for decades until Yamaha released its YZ400F four-stroke dirt bike, which won its first race (1997 Las Vegas Supercross) with relative ease.
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. Marty Smith, Jeremy McGrath, Ricky Carmichael and many other motocross legends dominated racing circuits on Honda CR's. CR's continue competing today ...
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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