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ENGINE
3.54
S Cylinder head gasket leak
S No valve clearance or incorrectly
adjusted
S Cylinder or piston worn
S Piston rings worn, leaking, broken, or
sticking
S Bent valve or stuck valve
S Valvespringbrokenorweak
S Valve not seating properly (bent or
carbon accumulated on sealing surface)
S Rocker arm sticking
Backfiring
S ETC or speed limiter system malfunction
S Fouled spark plug or incorrect plug or
plug gap
S Carburetion faulty - lean condition
S Exhaust system air leaks
S Ignition system faulty:
Spark plug cap cracked/broken
Ignition coil faulty
Ignition or kill switch circuit faulty
Ignition timing incorrect
Sheared flywheel key
S Poor connections in ignition system
S System wiring wet
S Valve sticking
S Air leaks in intake
S Lean condition
COOLING SYSTEM
TROUBLESHOOTING
Overheating
S Low coolant level
S Air in cooling system
S Wrong type of coolant
S Faulty pressure cap or system leaks
S Restricted system (mud or debris in
radiator fins or restriction to air flow,
passages blocked in radiator, lines,
pump, or water jacket)
S Lean mixture (restricted jets, vents, fuel
pump or fuel valve)
S Fuel pump output weak
S Restricted radiator (internally or cooling
fins)
S Water pump failure
S Cooling system restriction
S Cooling fan inoperative or turning too
slowly (perform current draw test)
S Ignition timing misadjusted
S Low oil level
S Spark plug incorrect heat range
S Faulty hot light circuit
S Thermostat stuck closed or not opening
completely
Temperature Too Low
S Thermostat stuck open
Leak at Water Pump Weep Hole
S Faulty water pump mechanical seal
(coolant leak)
S Faulty pump shaft oil seal (oil leak)