{"title":"DIY Maintenance \u0026 Repair Manuals for Yamaha YZ490 Motorcycles","description":"\u003cp\u003eOur manuals are the trusted choice for DIY motorcycle repair, servicing and MOT preparation. 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repair handbook, quick reference data, torque specifications, serial numbers guide, mechanic tips manual, troubleshooting yamaha yz, engine starting troubleshooting, engine performance troubleshooting, engine noise troubleshooting, excessive vibration troubleshooting, two-stroke pressure test, clutch troubleshooting, transmission troubleshooting, brakes troubleshooting, water-cooling system yz125, water-cooling system yz250, ignition system troubleshooting, lubrication maintenance tune-up, periodic maintenance schedule, engine lubrication, clutch transmission oil change, front fork oil change, front fork air pressure, drive chain adjustment, clutch adjustment, coolant change, air cleaner service, engine tune up, cylinder head torque, spark plug replacement, ignition timing adjustment, carburettor adjustments, carburettor pilot screw adjustment, idle speed adjustment, decarbonising engine, exhaust system decarbonising, engine removal installation, cylinder head service, cylinder 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