Troubleshooting; Starting Failure/Hard Starting; Fuel System; Electrical System - Yamaha XVS650 Service Manual

IS THRTB~L
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STARTING FAILURE/HARD STARTING
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EB900000
TROUBLESHOOTING
NOTE:
The following guide for troubleshooting does not cover all the possible causes of problems.
It should be helpful, however, as a guide to troubleshooting. Refer to the relative procedure
in this manual for inspection, adjustment and replacement of parts.
STARTING FAILURE/HARD STARTING
FUEL
SYSTEM
Fuel tank
• Empty
• Clogged fuel filter
• Clogged fuel strainer
• Clogged fuel tank drain hose
• Clogged roll-over valve
• Clogged roll-over varve breather hose
• Deteriorated or contaminated fuel
Fuel cock
• Clogged fuel hose
ELECTRICAL SYSTEM
Spark plug
• Improper plug gap
• Worn electrodes
• Wire between terminals severed
• Improper heat range
• Faulty spark plug cap
Ignition coil
• Broken or shorted primary/secondary
• Faulty spark plug lead
• Broken body
Full-transistor system
• Faulty ignitor unit
• Faulty pickup coil
8-1
Carburetor
• Deteriorated or contaminated fuel
• Clogged pilot jet
• Clogged pilot air passage
• Sucked-in air
• Deformed float
• Worn needle valve
• Improperly sealed varve seat
• Improperly adjusted fuel level
• Improperly set pilot jet
• Clogged starter jet
• Faulty starter plunger
• Improperly adjusted starter cable
Air filter
• Clogged air filter element
Fuel pump
• Faulty fuel pump
• Faulty relay unit (fuel pump relay)
Switch and wiring
• Faulty main switch
• Faulty engine stop switch
• Broken or shorted wiring
• Faulty neutral switch
• Faulty start switch
• Fau Ity sidestand switch
• Faulty clutch switch
DJ
Starter motor :
• Faulty starter motor
• Faulty starter relay
• Faulty relay unit (starter circuit cut-off
relay)
• Faulty starter clutch