Motocross & Off-Road Performance Handbook
  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 | 2000-2003 Honda CR125 | 1998-1999 Honda CR125 | 1990-1997 Honda CR125 | 1985-1989 Honda CR125 | 2002-2004 Honda CR250 | 1997-2001 Honda CR250 | 1992-1996 Honda CR250 | 1990-1991 CR250 | 2002-2004 Honda CRF450 | 1990-2001 Honda CR500 | 1985-1989 Honda CR250 and CR500 | Honda XR tuning.
CHAPTER TWELVE: TUNING TIPS FOR KAWASAKI DIRT BIKES
2000-2004 Kawasaki KX65 | 1990-2000 Kawasaki KX60 | 1998-2004 Kawasaki KX100 | 1994-1997 Kawasaki KX100 | 1998-2004 Kawasaki KX80/85 | 1990-1997 Kawasaki KX80 | 1985-1990 Kawasaki KX80 and KX100 | 2001-2004 Kawasaki KX125 | 1998-2000 Kawasaki KX125 | 1997 Kawasaki KX125 | 1993-1996 Kawasaki KX125 | 1992 Kawasaki KX125 | 1990-1991 Kawasaki KX125 | 1985-1989 Kawasaki KX125 | 1988-1989 Kawasaki KX125 | 2004 Kawasaki KXF250 | 2001-2004 Kawasaki KX250 | 1997-2000 Kawasaki KX250 | 1993-1996 Kawasaki KX250 | 1991-1992 Kawasaki KX250 | 1990 Kawasaki KX250 | 1985-1989 Kawasaki KX250 and KX500 | 1990-2004 Kawasaki KX500 | 1983-1995 Kawasaki KDX200.
CHAPTER THIRTEEN: TUNING TIPS FOR SUZUKI DIRT BIKES
2002-2004 Suzuki RM85 | 1990-2001 Suzuki RM80 | 1997-2004 Suzuki RM125 | 1990-1996 Suzuki RM125 | 1985-1989 Suzuki RM125 | 2001-2004 Suzuki RM250 | 1996-2000 Suzuki RM250 | 1993-1995 Suzuki RM250 | 1990-1992 Suzuki RM250 | 1985-1989 Suzuki RM250 | 1989-1999 Suzuki RMX250.
CHAPTER FOURTEEN: TUNING TIPS FOR YAMAHA DIRT BIKES
2002-2004 Yamaha YZ85 | 1993-2004 Yamaha YZ100 Conversion | 1993-2001 Yamaha YZ80 | 1997-2004 Yamaha YZ125 | 1994-1996 Yamaha YZ125 | 1992-1993 Yamaha YZ125 | 1990-1991 Yamaha YZ125 | 1985-1989 Yamaha YZ125 | 2001-2004 Yamaha YZF250 | 1999-2004 Yamaha YZ250 | 1997-1998 Yamaha YZ250 | 1994 Yamaha YZ250 cylinder and long rod kit | 1992-1996 Yamaha YZ250 | 1991-1992 Yamaha YZ250 | 1985-1990 Yamaha YZ250 | 2003-2004 Yamaha YZF450 | 2000-2002 Yamaha YZF426 | 1998-1999 Yamaha YZF400.
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