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Yamaha YZ250
The Yamaha YZ250 is a two-stroke motocross race bike made by Yamaha. It was launched in 1974 and has been regularly updated since. It is one of the only two-stroke bikes of this displacement to be still be in production and release every year. For the yz250 the top speed is 85 mph.
==Engine==
The YZ250 has a 249 cc liquid-cooled two-stroke reed-valved engine with a YPVS exhaust valve for a wider spread of power. The engine produces a peak at 8,800 rpm and of torque at 7,500 rpm, with a 9,000 rpm redline (Motocross Action Magazine).
From 1974 through 1982 the engine sported a 70 mm bore and a 64 mm stroke to produce a displacement of 250 cc. In 1983, the bore was reduced to 68 mm and the stroke was increased to 68 mm producing a displacement of 247 cc. In 1999, the bore was further reduced to 66.4 mm and the stroke lengthened to 72 mm producing a displacement of 249 cc. The longer stroke engine resulted in a lower redline, slightly less top end power and greatly improved torque at lower RPM.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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