Service Yamaha YFM660 YFM660RN YFM660RNC 2001 contains maintenance schedule and the repair procedures you need.
The Repair Manual for Yamaha YFM660 YFM660RN YFM660RNC contains:
General Information
Specifications
Periodic Checks and Adjustments
Engine
Carburetor
Drive Train
Chassis
Electrical
Troubleshooting
Wiring Diagram