Yamaha 2007 FZ6-NA Service Manual

Contents

TROUBLESHOOTING9-1EAS28450TROUBLESHOOTINGEAS28460GENERAL INFORMATIONNOTE:The following guide for troubleshooting doesnot cover all the possible causes of trouble. Itshould be helpful, however, as a guide to basictroubleshooting. Refer to the relative proce-dure in this manual for checks, adjustments,and replacement of parts.EAS28470STARTING FAILURESEngine1. Cylinder(s) and cylinder head(s)• Loose spark plug• Loose cylinder head or cylinder• Damaged cylinder head gasket• Damaged cylinder gasket• Worn or damaged cylinder• Incorrect valve clearance• Improperly sealed valve• Incorrect valve-to-valve-seat contact• Incorrect valve timing• Faulty valve spring• Seized valve2. Piston(s) and piston ring(s)• Improperly installed piston ring• Damaged, worn or fatigued piston ring• Seized piston ring• Seized or damaged piston3. Air filter• Improperly installed air filter• Clogged air filter element4. Crankcase and crankshaft• Improperly assembled crankcase• Seized crankshaftFuel system1. Fuel tank• Empty fuel tank• Clogged fuel filter• Clogged fuel tank drain hose• Deteriorated or contaminated fuel2. Fuel pump• Faulty fuel pump• Faulty fuel pump relay3. Throttle body(-ies)• Deteriorated or contaminated fuel• Sucked-in airElectrical system1. Battery• Discharged battery• Faulty battery2. Fuse(s)• Blown, damaged or incorrect fuse• Improperly installed fuse3. Spark plug(s)• Incorrect spark plug gap• Incorrect spark plug heat range• Fouled spark plug• Worn or damaged electrode• Worn or damaged insulator• Faulty spark plug cap4. Ignition coil(s)• Cracked or broken ignition coil body• Broken or shorted primary or secondarycoils• Faulty spark plug lead5. Ignition system• Faulty ECU• Faulty crankshaft position sensor6. Switches and wiring• Faulty main switch• Faulty engine stop switch• Broken or shorted wiring• Faulty neutral switch• Faulty start switch• Faulty sidestand switch• Faulty clutch switch• Improperly grounded circuit• Loose connections7. Starting system• Faulty starter motor• Faulty starter relay• Faulty starting circuit cut-off relay• Faulty starter clutchEAS28490INCORRECT ENGINE IDLING SPEEDEngine1. Cylinder(s) and cylinder head(s)• Incorrect valve clearance• Damaged valve train components2. Air filter• Clogged air filter elementFuel system1. Throttle body(-ies)• Damaged or loose throttle body joint• Improperly synchronized carburetors• Improperly adjusted engine idling speed(throttle stop screw)