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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 Honda CR250R was a Honda racing dirt bike. The prototype was built in 1971, but it was not until late 1972 that production of the 1973 model "out of the box racers" began sale to the general public. The CR250 was produced for nearly 37 years, 2007 being the final year of production. [2]
The first bike manufactured by Yamaha was actually a copy of the German DKW RT 125; it had an air-cooled, two-stroke, single cylinder 125 cc engine [1] YC-1 (1956) was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke.
In 2002, the only real change was the bike was made faster and lighter and the electronic power valve and third-generation aluminum frame. It had a five-speed transmission with Showa suspension and a two-gallon fuel tank. [10] The 2001 CR250R is considered the pinnacle of 250cc Honda two-stroke engineering.
The motorcycle was outfitted with a 250cc air-cooled two-stroke, single cylinder engine which was ready to use on dirt roads. The bike had several off-road features including: an aluminum skid plate under the crankcase, Serrated Footpegs, turn signals with supported by rubber mounts. [2]