Chapter 8. Troubleshooting; Starting Failure/Hard Starting; Fuel System; Electrical System - Yamaha XVS6501997 Service Manual

EB900000
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 in-
spection, adjustment and replacement of parts.

STARTING FAILURE/HARD STARTING

FUEL SYSTEM

Fuel tank
D Empty
D Clogged fuel filter
D Clogged fuel strainer
D Clogged fuel tank drain hose
D Clogged roll-over valve
D Clogged roll-over valve breather hose
D Deteriorated or contaminated fuel
Fuel cock
D Clogged fuel hose

ELECTRICAL SYSTEM

Spark plug
D Improper plug gap
D Worn electrodes
D Wire between terminals severed
D Improper heat range
D Faulty spark plug cap
Ignition coil
D Broken or shorted primary/secondary
D Faulty spark plug lead
D Broken body
Full-transistor system
D Faulty ignitor unit
D Faulty pickup coil
STARTING FAILURE/HARD STARTING
TROUBLESHOOTING
Carburetor
D Deteriorated or contaminated fuel
D Clogged pilot jet
D Clogged pilot air passage
D Sucked-in air
D Deformed float
D Worn needle valve
D Improperly sealed valve seat
D Improperly adjusted fuel level
D Improperly set pilot jet
D Clogged starter jet
D Faulty starter plunger
D Improperly adjusted starter cable
Air filter
D Clogged air filter element
Fuel pump
D Faulty fuel pump
D Faulty relay unit (fuel pump relay)
Switch and wiring
D Faulty main switch
D Faulty engine stop switch
D Broken or shorted wiring
D Faulty neutral switch
D Faulty start switch
D Faulty sidestand switch
D Faulty clutch switch
Starter motor
D Faulty starter motor
D Faulty starter relay
D Faulty relay unit (starter circuit cut-off relay)
D Faulty starter clutch
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TRBL
SHTG