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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 motorcycle is powered by a split-single two-stroke engine (two pistons sharing a single combustion chamber). It was marketed in the United States by Sears as the "Allstate 250" or "Twingle", with the model number SR 250, and sold primarily via the Sears catalog. [1] It was a common "first motorcycle" for many riders. [2]
The Kawasaki KR250 was a racing motorcycle built by Kawasaki from 1975 to 1982 for the 250 cc class of Grand Prix motorcycle racing.It was powered by a two-stroke "tandem twin" engine [1] [2] The motorcycle won four world championships, in 1978 and 1979 with Kork Ballington and in 1980 and 1981 with Anton Mang.
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 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.
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.
Ram Air engine. The T250's engine was a development of the earlier T20, which had been introduced in 1966. The 180° piston ported two stroke twin was of unit construction and had alloy head and alloy barrels with cast iron liners. Bore and stroke were 54 mm × 54 mm (2.1 in × 2.1 in) and the claimed power output was 31 bhp (23 kW) @ 7,000 rpm.
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