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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 Yamaha PW50 is a commercially available two-stroke 50 cc (3.1 cu in) mini dirt bike, designed, developed and produced by Japanese manufacturer Yamaha since 1980. [ 7 ] [ 8 ] [ 9 ] References
The fastest production motorcycle for a given year is the unmodified motorcycle with the highest tested top speed that was manufactured in series and available for purchase by the general public. Modified or specially produced motorcycles are a different class, motorcycle land-speed record .
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The KTM 300 is a series of 2-stroke enduro / off-road motorcycles made by KTM.They are the Penton-inspired 1984 300 GS, the 300 DMX, the dirt only 300 MXC, European road legal 300 EXC and the US 300 XC (close-ratio), 300 XC-W (wide-ratio gear box) and 300 SX (Motocross) versions.
The 2014 was provided with a new master cylinder/reservoir with a smaller diameter piston and new lever for a lighter pull. The 2015 200s received KTM orange paint for the frame, Neken handlebars, black anodized rims, a new MAE speedometer and a new, lighter 3Ah battery. [6] The 2016 front axle was reduced from 26 mm to 22 mm to reduce weight.