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.

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 46.8 horsepower at 8800 rpm and 30.6 foot pound-force of torque at 7500 rpm, with a 9000 rpm redline (Motocross Action Magazine). In fact, it is still making 45.0 horsepower at 9100 rpm and 41.6 horsepower at 9600 rpm before the rev limiter kicks in.

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 perimeter frame made entirely from aluminum, which brought the dry weight down to 212 pounds. 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 (30.0 cm) of travel. Front and rear hydraulic disc brakes round out the YZ.

Championships

The YZ250 holds many championships: 5 AMA National Motocross Titles
9 AMA National Supercross Titles
Most recently, Chad Reed rode the YZ250 to an AMA National Supercross title in 2004.

Translation

The phrase "Yamaha YZ250" occurs as such in the following languages: English, Hungarian.