Book excerpt: Complete coverage for your Yamaha YZ and WR 4-Stroke Motocross & Off-road Bikes for 1998 thru 2008: --Routine Maintenance and servicing --Tune-up procedures --Engine, clutch and transmission repair --Cooling system --Fuel and exhaust --Ignition and electrical systems --Brakes, wheels and tires --Steering, suspension and final drive --Frame and bodywork --Wiring diagrams --Reference Section With a Haynes manual, you can do it yourself…from simple maintenance to basic repairs. Haynes writes every book based on a complete teardown of the vehicle. We learn the best ways to do a job and that makes it quicker, easier and cheaper for you. Our books have clear instructions and hundreds of photographs that show each step. Whether you're a beginner or a pro, you can save big with Haynes! Step-by-step procedures --Easy-to-follow photos --Complete troubleshooting section --Valuable short cuts