Service Yamaha YFM50S 2003 contains maintenance schedule and the repair procedures you need.
The Repair Manual for Yamaha YFM50S contains:
General Information
Specifications
Periodic Checks and Adjustments
Engine
Carburetor
Drive Train
Chassis
Electrical
Troubleshooting
Wiring Diagram
Buy now the Repair Manual Yamaha YFM50S 2003