Yamaha YXR660FAT Rhino 660 2005 Owner's Manual

The recommended oil type for the Yamaha Rhino 660 is 10W-40, suitable for wet clutch systems.
The air filter should be checked and cleaned every 20 hours of operation or more frequently in dusty conditions, and replaced if necessary.
To adjust the valve clearance, remove the necessary covers, rotate the engine to the correct position, and use a feeler gauge to ensure the clearance is within specifications: 0.10 mm (intake) and 0.15 mm (exhaust).
Check the battery charge, inspect the starter relay and solenoid, ensure fuel supply is adequate, and verify the ignition system is functioning.
Stop the engine immediately to cool down, check coolant levels, inspect the radiator for blockages, and ensure the cooling fan is operational.
Clean the vehicle thoroughly, change the oil, fill the fuel tank with stabilizer, disconnect the battery, and store in a dry location.
The torque specification for the wheel lug nuts is 75 ft-lbs (102 Nm).
Consider upgrading to adjustable shocks, adjust existing shock preload, and ensure proper tire inflation for improved handling.
The recommended tire pressure is 7 psi for the front tires and 10 psi for the rear tires.
Use a multimeter to check for continuity in fuses, inspect wiring for damage, and ensure all ground connections are secure.