Motorcycle specifications Yamaha WR 250 F 2017 The YZ invites itself to enduro racing

the WR 250 F changes only its front brake disc for the 2017 model year, increasing it to 270 mm. In 2015, Yamaha unveiled a completely redesigned WR 250 F: the first enduro bike to feature Yamaha's famous rear-tilted engine with inverted cylinder head.

developed from the 2014 YZ 250 F, winner of the AMA MX250 motocross championship, the WR 250 F has the potential to win the toughest competitions.

the engine of the WR 250 F is closely derived from the fuel-injected engine of the YZ 250 F, which has enjoyed such recent success. For the first time in the enduro world, the engine features a rearward-tilted cylinder with an inverted cylinder head. The airbox is located in front of the rider, and the fuel tank in the middle of the bike. This unique layout contributes to the centering of mass, a key factor in lively, agile handling.

the WR 250 F retains the same bore and stroke dimensions, compression ratio, cam profile, forged aluminum piston and case-hardened crankshaft as the YZ 250 F. Compared with the previous WR 250 F engine, the 2015 / 2017 version is considerably more powerful at high revs, and also offers a stronger feeling of power throughout the rev range.

in addition to its long 6-speed transmission, the WR 250 F is equipped with a special enduro clutch whose characteristics enable it to meet extreme demands.

made entirely of aluminum, the WR 250 F's double-beam frame is closely derived from that of the YZ 250 F.

one of the outstanding features of the YZ 250 F is its front suspension system. The separation of the air and oil chambers is the main reason behind the success of this high-tech inverted fork.
This idea of separate air and oil chambers reduces aeration and cavitation over bumps, offering more stable damping. This state-of-the-art system is used on the WR 250 F with specific settings for enduro use.

the WR 250 F benefits from the same rear shock absorber as the YZ 250 F. To meet the diverse requirements of enduro riding, the shock absorber length, spring rate and stroke have been optimized. Compared to the YZ 250 F, the WR-F has a 4 mm longer shock absorber, which increases rear travel by 10 mm.

wR 250 F technical specifications

engine

- Based on the 2014 YZ 250 F model
- Rear-tilted fuel-injected engine
- Inverted cylinder head with direct front intake
- snake exhaust for improved mass centering
- Engine tuning via Yamaha Power Tuner
- Long 6-speed gearbox with enduro clutch
- Electric starter with switchless system
- 1,100 cm³ engine oil capacity, 200 cm³ more than the YZ 250 F model
- WR 450 F alternator and MF battery
- Top-mounted air filter with quick-release fasteners
- Redesigned decompressor

frame

- Compact aluminum frame with short rear loop
- Bilateral-beam aluminum frame
- Centered 7.5-liter fuel tank
- YZ-F-type front forks with separate air/oil system
- 10 mm more rear wheel travel than YZ 250 F
- 18-inch rear wheel
- Metzeler 6 Days Extreme FIM tires
- Lightweight side stand
- WR450F-type front and rear lights
- Crankcase guard
- Speedometer, fuel level and engine lights
- Long, flat seat with concealed fuel filler cap

Photo credits: Yamaha France