Yamaha YFM09RYXM Raptor 90 2021 Owner's Manual
![Yamaha YFM09RYXM Raptor 90 2021 manual cover](/images/8a31066cc741de5818425cab/thumbs/thumb175x175.webp)
The recommended tire pressure for the Yamaha Raptor 90 2021 is 4 psi for the front tires and 4.4 psi for the rear tires.
It is recommended to change the oil every 20 hours of operation or every 6 months, whichever comes first. Always use the oil grade specified in the owner's manual.
Yamaha recommends using Yamalube 4, 10W-40 or 20W-50, depending on the ambient temperature. Always ensure the oil meets or exceeds the specified API service category.
To adjust the chain tension, loosen the rear axle nuts, turn the adjuster bolts to achieve the correct slack (10-20mm), and then retighten the axle nuts. Always refer to the service manual for precise instructions.
If the Raptor 90 won't start, check the battery charge, ensure the fuel valve is open, verify there's fuel in the tank, and inspect the spark plug for fouling. If issues persist, consult a professional technician.
Performance can be improved by regularly maintaining the air filter, using high-quality fuel, ensuring proper tire pressure, and considering aftermarket performance parts like exhaust systems or tuning kits.
For off-season storage, clean the vehicle thoroughly, change the oil, stabilize the fuel, disconnect the battery, and store it in a dry, covered area. Elevate the vehicle to prevent tire flat spots.
To clean the air filter, remove the filter cover, take out the filter, wash it with mild soap and water, let it dry completely, and apply air filter oil before reinstalling.
If overheating, check the engine oil level, ensure there's adequate airflow to the engine, inspect for obstructions, and verify that the cooling fins are clean and unobstructed.
Routine maintenance includes checking and changing the oil, inspecting the brakes, checking the tire pressure, lubricating the chain, and inspecting the air filter monthly or as needed.