YZ250
From Yamaha Wiki
| Manufacturer | Yamaha |
|---|---|
| Production | 1974- |
| Successor | YZ450 |
| Class | Motocross |
| Engine | 250 cc single-cylinder, water-cooled, two-stroke, case reed |
| Power (physics) | 47 hp[1] |
| Torque | 29 ft·lbf[2] |
| Transmission (mechanics) | 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 |
| Seat height | 39.1 inches |
| Weight | 212 lb (96 kg) |
| Fuel capacity | 2.1 US gallons |
| Related | Yamaha YZ450F |
The YZ250 is a legendary 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.
Contents |
Engine
The YZ250 has a 249 cc liquid-cooled Two stroke reed valved engine with a 2-stroke power valve system exhaust valve for a wider spread of power. The engine produces 47 horsepower (35 kW) and 29 foot-pounds force (39 N·m) of torque, with a 9,000 rpm redline. [3]
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. [4] The bike has a Monoshock rear suspension system with more than a foot of travel, as well as telescopic inverted forks with 11.8 inches (300 mm) of travel. [4] Front and rear hydraulic disc brakes round out the YZ.
Championships
The YZ250 holds many championships:
- 5 AMA National Motocross Titles [5]
- 9 AMA National Supercross Titles [5]
- Most recently, Chad Reed rode the YZ250 to an AMA National Supercross title in 2004. [6]
