Yamaha YZ400F YZ426F WR400F & WR426F Motorcycle (1998-2002) Service Repair Manual Description Clymer motorcycle repair manuals are written specifically for the do-it-yourself enthusiast. From basic maintenance to troubleshooting to complete overhaul Clymer manuals provide the information you need. The most important tool in your tool box may be your Clymer manual get one today. Every Clymer manual contains hundreds of original photographs and illustrations developed from a complete disassembly and assembly of a motorcycle. This in addition to extensive research allows Clymer to achieve an unmatched level of detail accuracy and clarity. The step-by-step instructions and two-column text with large print are user-friendly. Bold figure numbers make it easy to quickly match instructions with illustrations and photos. Thumb-tabbed chapters numbered table of contents and an extensive index make it possible to locate the desired section quickly. Contents This Yamaha motorcycle manual is 376 pages. QUICK REFERENCE DATA CHAPTER ONE / GENERAL INFORMATION Manual organization / Warnings cautions and notes / Safety / Serial numbers / Fasteners / Shop supplies / Basic tools / Precision measuring tools / Electrical system fundamentals / Special tools / Basic service methods / Storage / Specifications CHAPTER TWO / TROUBLESHOOTING Starting the engine / Engine spark test / Engine performance / Engine noise / Engine leakdown test / Clutch / External shift mechanism and transmission / Kickstarter / Brakes / Steering / Specifications CHAPTER THREE / LUBRICATION MAINTENANCE AND TUNE-UP Pre-ride inspection / Engine break-in / Tune-up and service intervals / Fuel and lubricants / Engine and component lubrication / Engine oil and filter change / Front fork oil seal and dust seal cleaning and lubrication / Drive chain cleaning and lubrication / Maintenance and inspection / Hot Start Valve (Air valve) inspection / Muffler cleaning / Air filter cleaning / Coolant change / Drive chain adjustment / Clutch cable adjustment / Compression release cable adjustment / Engine tune-up / Valve clearance adjustment / Carburetor idle speed and mixture adjustment / Ignition timing check / Compression check / Spark plug / Specifications CHAPTER FOUR / ENGINE TOP END Exhaust system / Cylinder head cover / Camshafts and cam chain tensioner / Cylinder head / Valves / Cylinder / Piston and piston rings / Specifications CHAPTER FIVE / ENGINE LOWER END Removal installation / Crankcase / Crankcase seal and bearing replacement / Crankshaft / Engine break-in / Specifications CHAPTER SIX / CLUTCH OIL PUMP AND EXTERNAL SHIFT MECHANISM Clutch cover / Clutch and push lever / Right crankcase cover / Balancer and primary drive gears / External shift mechanism / Kickstarter / Oil pump / Specifications CHAPTER SEVEN / TRANSMISSION AND INTERNAL SHIFT MECHANISM Transmission operation / Service notes / Mainshaft / Countershaft / Transmission inspection / Shift drums and forks / Specifications CHAPTER EIGHT / FUEL SYSTEM Service precautions and practices / Carburetor / Float adjustment / Carburetor rejetting / Throttle cable / Specifications CHAPTER NINE / ELECTRICAL SYSTEM Left crankcase cover / Flywheel and stator / Ignition and switch testing / Throttle position sensor / CDI unit / Ignition timing / Lighting system / Voltage regulator / Specifications CHAPTER TEN / COOLING SYSTEM Radiators / Water pump / Specifications CHAPTER ELEVEN / WHEELS TIRES AND DRIVE CHAIN<...