Yamaha WR450FJ WR450F 2017 Owner's Manual

The recommended oil type for the 2017 Yamaha WR450F is a high-quality 4-stroke engine oil, SAE 10W-40. The oil capacity is approximately 1.16 liters (1.23 US quarts) with a filter change.
It's recommended to clean the air filter after every ride in dusty conditions or every 5-10 hours of riding in normal conditions. Regular maintenance ensures optimal engine performance.
The proper chain tension should allow for 30-40mm of slack at the midpoint between the sprockets when the bike is on a stand. Ensuring correct tension prevents excessive wear.
Check the battery charge, inspect the spark plug for fouling, ensure the fuel is fresh, and verify the kill switch is in the correct position. These steps often resolve common starting issues.
For general off-road use, the recommended tire pressure is 12 psi for the front tire and 12-15 psi for the rear tire. Adjust according to terrain and rider preference.
Adjust the front fork and rear shock absorber settings using the compression and rebound clickers. Refer to the owner's manual for baseline settings and adjust according to riding conditions and personal preference.
After a muddy ride, thoroughly clean the bike, inspect and lubricate the chain, clean the air filter, check brake pads for wear, and inspect the electrical connections for moisture.
To replace the headlight bulb, remove the headlight assembly by loosening the mounting screws. Disconnect the electrical connector, remove the old bulb, and insert the new one. Reassemble in reverse order.
For winter storage, clean the bike thoroughly, change the oil and filter, add a fuel stabilizer, disconnect the battery, and store the bike in a dry place. Cover it to protect from dust.
To adjust the throttle free play, locate the adjuster on the throttle cable near the handlebar. Loosen the locknut, turn the adjuster to achieve 3-5mm of free play, and retighten the locknut.