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The Rotax Type 256 is a 250 cc (15 cu in) two-stroke parallel twin-cylinder racing engine, designed, developed and produced by Rotax, between 1980 and 1998.It was primary used in kart (especially kart racing) applications, as well as motorcycle racing applications, such as competing in the 250cc class of the Grand Prix motorcycle World Championship.
The 250cc four-stroke single-cylinder engine is equipped by regulation with a limiter at 13,500 rpm (earlier 14,000 rpm, before Moto3 regulation changes), with maximum torque output beginning at around 10,500 rpm. [1] The engine feeds a 6-gear transmission according to regulations.
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.
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines. [1] [2] This ...
Developed as competition for the emerging scooter market, the Veeline still had the underpowered engine of the Valiant and did not sell in sufficient numbers. [4] The big fairing also added 21 pounds (9.5 kg) to the weight and £21 to the cost and after poor sales Velocette decided to stop production of the version in 1961.
At a cost of around $6,000 new on release it was seen as an expensive bike for a 250cc. The parallel twin 2MA variant being the UK variant and the 1KT model being the domestic Japanese model that were also fitted with a more restrictive CDI to comply with Japanese laws which stipulated an upper limit of 45 hp for 250cc motorcycles. [2]
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