This is the same manual that your local dealer uses to diagnose & service your 4 wheeler !! 320+ PAGES OF VERY USEFUL INFORMATION FOR MAINTAINING AND REPAIRING YOUR YAMAHA RAPTOR 660.FACTORY SERVICE MANUAL HERE IS WHAT THE MANUAL COVERS General Information Maintenance Engine Removal and Installation Engine Fuel System Engine Lubrication and Cooling Engine Combustion System Transmission System Front Wheel and Steering System Rear Wheel System Fenders and Exhaust Pipe Electrical System Troubleshooting