Yamaha YXR70FX Service Manual
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Contents
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10 - 1TRBLSHTGEBS00537TROUBLESHOOTINGTIP:_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 check,adjustment and replacement of parts.STARTING FAILURE/HARD STARTINGFUEL SYSTEMFuel tank• Empty• Clogged fuel tank breather hoses• Deteriorated or contaminated fuelFuel pump• Faulty fuel pump• Faulty fuel injection system relayThrottle body• Deteriorated or contaminated fuel• Sucked-in airAir filter• Clogged air filter elementELECTRICAL 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 bodyIgnition system• Faulty ECU• Faulty crankshaft position sensor• Broken AC magneto rotor woodruff keySwitches and wiring• Faulty main switch• Broken or shorted wiring• Faulty gear position switch• Faulty brake light switchStarting system• Faulty starter motor• Faulty starter relay• Faulty starter clutchBattery• Faulty batteryFuse(s)• Blown, damaged or incorrect fuse• Improperly installed fuseSTARTING FAILURE/HARD STARTING |
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