Yamaha YFM660RN C Raptor 2001 Owner's Manual
![Yamaha YFM660RN C Raptor 2001 manual cover](/images/8dc95962d107a6e8982e37a7/thumbs/thumb175x175.webp)
To improve fuel efficiency, regularly check and replace the air filter, maintain proper tire pressure, and ensure the carburetor is correctly tuned.
It's recommended to use a high-quality 10W-40 4-stroke motorcycle oil that meets or exceeds API service classifications SG or higher.
Check the battery charge, inspect the spark plug for wear and proper gap, and ensure the fuel is fresh and the fuel lines are clear.
Regular maintenance includes oil and filter changes, checking and adjusting the valve clearance, inspecting the brake pads and fluid, and cleaning the air filter.
The spark plug should be inspected every 3,000 miles and replaced if necessary, or as part of the annual maintenance schedule.
The recommended tire pressure is typically 4 psi for the front tires and 5 psi for the rear tires, but always refer to the owner's manual for specific guidance.
Loosen the rear axle nut, adjust the chain tensioner bolts until the chain has about 1 inch of slack, and then retighten the axle nut.
Overheating could be caused by low coolant levels, a clogged radiator, a faulty thermostat, or a malfunctioning fan. Check these components if overheating occurs.
To clean the carburetor, remove it from the ATV, disassemble it carefully, clean all parts with carburetor cleaner, and reassemble it, ensuring all jets and passages are clear.
Common symptoms include difficulty shifting gears, slipping clutch, unusual noises during operation, and a burning smell from the clutch area.