Service Yamaha YFZ450S 2004 contains maintenance schedule and the repair procedures you need.
The Repair Manual for Yamaha YFZ450S contains:
General Information
Specifications
Periodic Checks and Adjustments
Engine
Carburetor
Drive Train
Chassis
Electrical
Troubleshooting
Wiring Diagram
Buy now the Repair Manual Yamaha YFZ450S 2004