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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.
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 Honda RS250R featured a V-twin 250 cc two-stroke engine with a V-angle of 90 degrees. A new 75 degrees V-twin was introduced in 1993. A new 75 degrees V-twin was introduced in 1993. Between 1984 and 2009 the RS250R has been produced in four different generations, named: ND5 (1984), NF5 (1987), NX5 (1993) and NXA (2001).
Engine Type Liquid-cooled, single cylinder, two-stroke Displacement 249cc Bore and stroke 70 mm × 64.8 mm (2.76 in × 2.55 in) Compression ratio 7.2 : 1 Lubrication System Fuel and oil premixture of 20 : 1 Carburetion Mikuni VM32SS Transmission Manual Clutch, 5-speed Gearshift Pattern 1-down, 4-up Starter Kick Start
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.
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]
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