Yamaha YZ 250
The YZ250 is a 2-stroke motocross race bike made by Yamaha. It was launched in the 1970s, and has been regularly updated since. Is still a very capable motocross and offroad machine. 2009 saw Jason Raines win his 5th AMA National Hare Scramble title and 2010 looks to be Jason Greer's turn on top with a 2010 YZ250 in the National Hare Scrambles.
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 30.6 foot-pounds force (41.5 N·m) of torque at 7500 rpm, with a 9000 rpm redline (Motocross Action Magazine). In fact, it is still making 45.0 horsepower (33.6 kW) at 9100 rpm and 41.6 horsepower (31.0 kW) at 9600 rpm before the rev limiter kicks in.
Yamaha YS 250 Engine
Model Type Off-Road, BASE MSRP(US) $6,990.00, Dealers Yamaha Dealers, Warranty 1
Engine Type Single-Cylinder, Cylinders 1, Engine Stroke 2-Stroke, Cooling Liquid, Valve Configuration Reed Valve, Bore (mm/in) 66.4 / 2.62, Stroke (mm/in) 72 / 2.84, Displacement (cc/ci) 249 / 15.2, Compression Ratio (Secondary) 10.9:1, Starter Kick, Fuel Requirements Regular, Ram Air Induction No, Fuel Type Gas / Oil Premix, Carburetion Brand Keihin, Fuel Injector No,Carburetor Yes, Number Of Carburetors 1, Carburetor Size (mm) 38,Carburetion Type Carburetor.
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