Yamaha PW50/80 Y-Zinger & BW80 Big Wheel Motorcycle (1981-2002) Clymer 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 416 pages. QUICK REFERENCE DATA CHAPTER ONE / GENERAL INFORMATION Manual organization / Notes cautions and warnings / Message to parents / Safety first / Cleaning parts / Handling gasoline safely / Service hints / Serial numbers / Warning labels / Torque specifications / Fasteners / Lubricants/ Sealants cements and cleaners / Threadlocking compound / Expendable supplies / Basic hand tools / Precision measuring instruments / Test equipment / Special tools / Mechanic s tips / Ball bearing replacement / Seals / Specifications CHAPTER TWO / TROUBLESHOOTING Operating requirements / Engine operating principles / Starting the engine / Starting difficulties / Engine starting troubles / Engine performance / Engine / Engine noises / Two-stroke leak down test / Fuel system / Electrical troubleshooting / Ignition system / Clutch and gearshift linkage / Transmission / Kickstarter / Drive train noise (PW50) / Drive train noise (BW80 and PW80) / Oil injection system / Handling/ Brakes / Specifications CHAPTER THREE / LUBRICATION MAINTENANCE AND TUNE-UP Service intervals / Tune-up / Engine oil / Transmission oil / Air filter / Spark plug / Carburetor / Exhaust system / Oil pump and engine oil lines / Engine compression check / Ignition timing / Control cable lubrication / Throttle and oil pump cable adjustment / Speed limiter adjustment / Brake lubrication inspection and cable adjustment / Final gear lubrication PW50 / Drive chain BW80 and PW80 / Front fork oil change BW80 and PW80 / Specifications CHAPTER FOUR / ENGINE PW50 Engine identification / Engine lubrication / Exhaust system / Cylinder head / Cylinder / Piston pin and ring / Reed valve assembly / Clutch / Primary drive gear / Kickstarter oil pump drive gear and kick pinion gear / Transmission / Crankcase and crankshaft / break-in / Specifications CHAPTER FIVE / ENGINE BW80 AND PW80 Engine identification / Engine lubrication / Exhaust system / Engine / Cylinder head / Cylinder / Piston piston pin and piston ring / Reed valve assembly / Primary drive gear and oil pump drive gear / Kickstarter / External shift mechanism / Crankcase and crankshaft / Transmission / Break-in / Specifications CHAPTER SIX / CLUTCH BW80 AND PW80 Right crankcase cover / Clutch service / Specifications CHAPTER SEVEN / FUEL SYSTEM Carburetor / Carburetor cleaning and inspection / Carburetor rejetting / Fuel tank and fuel valve / Throttle cables / Choke cable / Specifications CHAPTER EIGHT / ELECTRICAL SYSTEM Component testing / Capacitor discharge ignition / Flywheel / CDI unit / Ignition coil / Spe...