YZ250

Manufacturer	Yamaha
Production	1974-
Successor	Yamaha YZ450
Class	Motocross
Engine	250 cc single-cylinder, water-cooled, two-stroke, case reed
Power	41.3 hp[1]
Torque	32 ft·lbf[1]
Transmission	5-speed
Suspension	Monoshock, 12.8 inches travel
Brakes	double disc
Tires	Front: 80/100-21-51M ; Rear: 110/90-19-62M
Wheelbase	57.8 inches
Dimensions	L 85 inches W 32.5 inches H 51.2 inches
Seat height	39.1 inches
Weight	212 lb (96 kg) (dry)
Fuel capacity	2.1 US gallons
Related	Yamaha YZ450F

The Yamaha YZ250 is a two-stroke motocross race bike made by Yamaha. It was launched in the 1970s, and has been regularly updated since

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 48.8 horsepower (36.4 kW) at 8,800 rpm and 30.6 foot-pounds force (41.5 N·m) of torque at 7,500 rpm, with a 9,000 rpm redline (Motocross Action Magazine).

Chassis

Since its introduction in 1974, the YZ250 has had a single backbone steel frame. For the 2005 model year, however, the YZ250 has a new frame made entirely from aluminum, which brought the dry weight down to 212 lb (96 kg), and more recently in 2010, to 211 lb. The bike has a Swingarm rear suspension system with more than a foot of travel, as well as telescopic inverted forks with 11.8 inches (300 mm) of travel.^[2] Front and rear hydraulic disc brakes round out the YZ.

Championships

The YZ250 holds many championships:

• 5 AMA National Motocross Titles.^[3]
• 9 AMA National Supercross Titles^[3]
• Most recently, Chad Reed rode the YZ250 to an AMA National Supercross title in 2004.^[4]

See also

• YZ85
• YZ125
• YZ250F

References

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