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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.
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 ...
The engine for all KR-1 models was a two-cylinder, reed valve induction two-stroke motor of 249 cc (15.2 cu in) (somewhat based on the previous Yamaha TZ/TZR configurations). The 180° firing parallel twin configuration featured a crank driven balance shaft .
The bore/stroke ratio changed to 56 mm × 50.7 mm (2.20 in × 2.00 in). In addition, the cylinders received a so-called Yamaha Power Valve System (YPVS). The first model series (TZ 250 A) of the water-cooled twin with contactless thyristor magneto ignition had a power output of 51 HP, the last expansion stage [ clarification needed ] , the TZ ...
A straight-twin engine, also known as an inline-twin, vertical-twin, inline-2, or parallel-twin, is a two-cylinder piston engine whose cylinders are arranged in a line along a common crankshaft. Straight-twin engines are primarily used in motorcycles; other uses include automobiles, marine vessels, snowmobiles, jet skis , all-terrain vehicles ...
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 ...
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