Yamaha MBK YQ100 Manuale di Servizio Pagina 225

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TRBL
SHTG
8-1
STARTING FAILURE/HARD STARTING
TROUBLESHOOTING
NOTE:
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 inspection,
adjustment and replacement of parts.
STARTING FAILURE/HARD STARTING
FUEL SYSTEM
Fuel tank Carburetor
• Empty • Deteriorated fuel, fuel containing water or
• Clogged fuel filter foreign material
• Deteriorated fuel or fuel containing water or • Clogged pilot jet
foreign material • Clogged pilot air passage
• Clogged fuel tank cap • Sucked-in air
Fuel cock • Deformed float
• Clogged fuel hose • Groove-worn needle valve
• Clogged vacuum • Improperly sealed valve seat
• Faulty diaphragm • Improperly adjusted fuel level
Air filter • Improperly set pilot jet
• Clogged air filter • Clogged starter jet
• Starter plunger malfunction
• Improperly adjusted pilot air screw
ELECTRICAL SYSTEM
Spark plug CDI unit system
• Improper plug gap • Faulty CDI unit
• Worn electrodes • Faulty source coil
• Wire between terminals broken • Faulty pick-up coil
• Improper heat range Switches and wiring
• Faulty spark plug cap • Faulty main switch
Ignition coil • Broken or shorted wiring
• Broken or shorted primary/secondary coil • Faulty brake switch (front or rear)
• Faulty spark plug lead
• Broken body
Starter motor
• Faulty starter motor
• Faulty starter relay
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