Yamaha YFM400FAR Service Manual

Also see for YFM400FAR: Owner's manual Service manual Assembly manual

Contents

10 - 1TRBLSHTGSTARTING FAILURE/HARD STARTINGTROUBLESHOOTINGNOTE:The following troubleshooting does not cover all the possible causes of trouble. It should be helpful,however, as a guide to troubleshooting. Refer to the relative procedure in this manual for checking,adjusting and replacing of parts.STARTING FAILURE/HARD STARTINGFUEL SYSTEMFuel tank Empty Clogged fuel filter Clogged fuel strainer Clogged fuel breather hose Deteriorated or contaminated fuelFuel cock Clogged fuel hoseELECTRICAL SYSTEMSpark plug Improper plug gap Worn electrodes Wire between terminals broken Improper heat range Faulty spark plug capIgnition coil Broken or shorted primary/secondary Faulty spark plug lead Broken bodyCDI system Faulty CDI unit Faulty pickup coil Faulty charging/rotor rotation direction coil Broken woodruff keyCarburetor Deteriorated or contaminated fuel Clogged pilot jet Clogged pilot air passage Sucked-in air Deformed float Worn needle valve Improperly sealed valve seat Improperly adjusted fuel level Improperly set pilot jet Clogged starter jet Starter plunger malfunctionAir filter Clogged air filter elementSwitches and wiring Faulty main switch Faulty engine stop switch Broken or shorted wiring Faulty neutral switch Faulty reverse switch Faulty start switch Faulty rear brake switchStarter motor Faulty starter motor Faulty starter relay Faulty starter clutch