Yamaha YZ250

.The YZ250 is a 2-stroke motocross race bike made by Yamaha. It was launched in the 1970s, and has been regularly updated since. It is slowly being phased out and replaced by its four stroke rival, the YZ450F.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 46.8 horsepower (34.9 kW) at 8800 rpm and