This third edition of Motocross & Off-Road Performance Handbook is the complete guide to turning your motocross or off-road motorcycle into a wicked racing weapon. From suspension tuning to building a high-revving outdoor racer, tuner/journalist Eric Gorr gives you the inside line on tricking out your off-road machine. Whether you want a broader, more usable powerband for enduro competition, explosive low-end power for supercross, or more top-end boost for motocross racing, Motocross & Off-Road Performance Handbook takes a hands-on approach to getting the most from your engine. This new edition covers all current models of two- and four-stroke engines, including the latest high-performance four-strokes from Yamaha, Honda, Suzuki, Kawasaki, and KTM. The book includes: Rebuilding four-stroke top-ends Jetting and exhaust tuning Porting and reed valve modifications Suspension setup, tuning, and revalving Used bike evaluation Dual-sport conversions of off-road bikes Supermoto setups Tuning tips for late-model bikes Recommended tools and shop setup Race day preparations With this new edition of Motocross & Off-Road Performance Handbook, you'll have an arsenal of information to give your bike the competitive edge needed to capture the checkered flag. Table of Contents: ACKNOWLEDGEMENTS / INTRODUCTION. CHAPTER ONE: GETTING STARTED Types of dirt biking / Evaluating dirt bikes / Tips on test riding / Where to spend your money / Shopping for rebuilding and tuning services / Buying a used dirt bike / Selecting the right tools / Outfitting your workshop / Environmentally concious methods for cleaning parts. CHAPTER TWO: BASIC MAINTENANCE Dirt bike cleaning techniques / Fuels, lubricants, and fluids / Air intake system / Spark plug basics / Types of spark plugs / The throttle / Runaway throttle / Chain and sprocket basics / Tips for changing the sprockets / Cooling system / Clutch repair / Electrical and ignition systems / Fitting aluminum handlebars / Fitting radiator guard and tank stickers / Fitting seat covers and foam / Race day preparations. CHAPTER THREE: TRANSFORMING YOUR MX BIKE Converting your MX bike or dual-sport bike for off-road riding / Converting your MX bike for DTX or supermoto racing. CHAPTER FOUR: SUSPENSION and CHASSIS Baseline settings / Cartridge fork service and tuning / Rear shock servicing / Video suspension tuning / Frame care / Linkage service / Suspension terminology. CHAPTER FIVE: CARBURETOR TUNING The difference between two-stroke and four-stroke carburetors / Carburetor ID guide / Carburetor parts and function / Basic carburetor service / Mechanical problems / Jetting shouldn't be scary! / Fuel and oil mixture ratios / Tuning gauges. CHAPTER SIX: TWO-STROKE TOP-END REBUIDING Before you start / Maintenance and inspection / The piston / Cylinder and exhaust valve cleaning tips / Big bore kits / Troubleshooting piston failures / Two-stroke exhaust valves / Exhaust valve tips and tuning. CHAPTER SEVEN: TWO-STROKE LOWER-END REBUILDING The right tools / Electrical system disassembly and inspection / Clutch disassembly and inspection / Shifter, kick starter, and primary gear disassembly and inspection / Splitting the crankcases / Transmission disassembly and inspection / Bearing removal and installation / Crankshaft installation / Assembling the crankcases / Breaking in a new bottom-end / Crankshaft repair. CHAPTER EIGHT: TWO-STROKE ENGINES Two-stroke principles / How to choose a powerband / Tuning guide to performance modifications / Engine management systems / Performance mchining tools and techniques. CHAPTER NINE: FOUR-STROKE ENGINES Leak-down testing / Common problems / Four-stroke top-end rebuilding. CHAPTER TEN: WHEELS, TIRES, and BRAKES How to fix wheels / Wheel bearing repair / Tires / Brake systems. CHAPTER ELEVEN: TUNING TIPS FOR HONDA DIRT BIKES 1990-2004 Honda CR80/85 / 2000-200

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