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ENGINE
3.45
SPARK PLUG FOULING
G Spark plug cap loose or faulty
G Choke cable adjustment or
plunger/cable sticking
G Foreign material on choke plunger
seat or plunger
G Incorrect spark plug heat range or
gap
G Carburetor inlet needle and seat
worn
G Jet needle and/or needle jet worn or
improperly adjusted
G Excessive carburetor vibration
(loose or missing needle jet locating
pins)
G Loose jets in carburetor or calibration
incorrect for altitude/temperature
G Incorrect float level setting
G PVT system calibrated incorrectly or
components worn or mis-adjusted
G Fuel quality poor (old) or octane too
high
G Low compression
G Restricted exhaust
G Weak ignition (loose coil ground,
faulty coil, stator, or ETC switch)
G ETC switch mis-adjusted
G Restricted air filter (main or
pre-cleaner) or breather system
G Improperly assembled air intake
system
G Restricted engine breather system
G Oil contaminated with fuel
G Restricted oil tank vent
COOLING SYSTEM
TROUBLESHOOTING
Overheating
G Low coolant level
G Air in cooling system
G Wrong type of coolant
G Faulty pressure cap or system leaks
G Restricted system (mud or debris in
radiator fins or restriction to air flow,
passages blocked in radiator, lines,
pump, or water jacket)
G Lean mixture (restricted jets, vents, fuel
pump or fuel valve)
G Fuel pump output weak
G Restricted radiator (internally or cooling
fins)
G Water pump failure
G Cooling system restriction
G Cooling fan inoperative or turning too
slowly (perform current draw test)
G Ignition timing misadjusted
G Low oil level
G Spark plug incorrect heat range
G Faulty hot light circuit
G Thermostat stuck closed or not opening
completely
Temperature Too Low
G Thermostat stuck open
Leak at Water Pump Weep Hole
G Faulty water pump mechanical seal
(coolant leak)
G Faulty pump shaft oil seal (oil leak)
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