Yamaha YZ 250
Yamaha's famous and still popular 250 YZ was launched in 1969. It quickly became a great success in racing, but also for hobby MX riders. Thanks to numerous innovations over time, such as the reed valve, exhaust valves or monoshock absorbers, the Yamaha YZ 250 remained one of the leading motocross bikes and is still in production today.
The chassis and engine have undergone constant developments and upgrads over the course of its long career. It is particularly noteworthy that the engine from 1999 is still used today and that the aluminum frame has been the same since 2005.
The Yamaha YZ 250 is a modern motocross bike, although the basics were designed many years ago, but above all it is a reliable motorcycle with a high fun factor that satisfies its many riders across the board.
The motocross machine is not street legal and is intended for use on closed motocross tracks.
YZ 250: Engine
- Single cylinder 2-stroke engine
- YPVS exhaust valves
- Liquid cooling 1.2 L
- Displacement: 249 cc
- Bore x stroke: 66.4 x 72 mm
- Play piston / cylinder: 0.045 - 0.050mm
- Compression ratio: 8.9:1 (low rpm) / 10. 6:1 (high rpm)
- Transmission: 5-speed manual gearbox
- Clutch: Multi-plate clutch, manual
- Gear oil: SAE 10W40 JASO MA / API SG
- Oil volume: 800mL (total) / 750mL for oil change
- Carburetor: Keihin PWK 38
- Main jet: 178
- Pilot jet: 50
- Fuel: SP 95 / SP 98 (also E10)
- Spark plug: NGK BR8EG
- Gear ratio: 14x50 (520 chain, 114 links)
250 YZ: Chassis
- Aluminium frame with simple double cradle
- Front suspension: Kayaba inverted fork 48mm
- Front suspension travel: 300mm
- Rear suspension: Kayaba shock absorber with linkage
- Rear suspension travel: 315mm
- Front brake: 270mm brake disk
- Rear brake: 245mm brake disk
- Brake fluid: DOT4
- Front tire: 80/100-21
- Rear tire: 110/90-19
- Caster angle: 27.7°
- Seat height: 975mm
- Weight, full tank: 103 kg
- Tank: 7 L
Yamaha YZ 250 in our Shop
In our online store you will find a large selection of spare parts for your YZ 250.
For regular maintenance and minor repairs, we have engine oil, gear oil, spark plugs, levers and brake pads.
For larger projects, we stock pistons, crankshafts, gearbox bearings and clutches for the engine, as well as fork seals, linkage bearings and other suspension parts.
For racing drivers, we also offer tuning parts such as exhausts, reed valves, oversize brake kits or holeshot kits and other performance-enhancing parts.
