Yamaha YFM80RX Raptor 2008 Owners Manual EN

Regular maintenance includes checking the oil level, cleaning or replacing the air filter, inspecting the brakes, and lubricating the chain. It's also important to check the tire pressure and tighten any loose bolts.
Use a high-quality 4-stroke motorcycle oil with a viscosity grade of SAE 10W-30 or 10W-40. Make sure the oil meets the JASO MA standard for optimal performance.
If your ATV won't start, check the battery charge, ensure the fuel valve is on, and inspect the spark plug for wear or damage. Also, verify that the kill switch is in the correct position.
The recommended tire pressure for the front tires is 4 psi and for the rear tires is 4 psi. Always check the tire pressure when the tires are cold.
To adjust the chain tension, first loosen the rear axle nuts, then adjust the chain adjusters to achieve proper tension. The chain should have about 1 inch of slack in the middle. Tighten the axle nuts after adjustment.
The air filter should be inspected every 20 hours of operation and cleaned or replaced as necessary. If you frequently ride in dusty conditions, check it more often.
If your ATV overheats, stop the engine immediately and let it cool down. Check the coolant level if applicable and ensure the radiator is not clogged. Avoid running the engine at high RPMs for extended periods.
Improving performance can be achieved by upgrading the exhaust system, using a high-performance air filter, and ensuring regular maintenance. Proper tire inflation and alignment also contribute to better performance.
To store your ATV for the winter, clean it thoroughly, change the oil, add fuel stabilizer, and disconnect the battery. Store it in a dry, covered area to protect it from the elements.
To replace the spark plug, remove the spark plug cap, use a spark plug socket to unscrew the old plug, and install the new one by hand before tightening it with the socket. Ensure the gap is set to the manufacturer's specifications.