Engine General Information and Diagnosis: 1A-8
Engine stalls often (Fuel
injector improperly
operating)
Defective fuel injector. Replace.
No injection signal from ECM. Repair or replace.
Open or short circuited wiring
connection.
Repair or replace.
Defective magneto. Replace.
Defective battery or low battery voltage. Replace or recharge.
Engine stalls often
(Control circuit or sensor
improperly operating)
Defective ECM. Replace.
Defective fuel pump. Replace.
Defective TP sensor. Replace.
Defective IAT sensor. Replace.
Defective CKP sensor. Replace.
Defective ECT sensor. Replace.
Defective TO sensor. Replace.
Engine stalls often
(Engine parts improperly
operating)
Fouled spark plug. Clean.
Defective CKP sensor or ECM. Replace.
Clogged fuel feed hose or fuel delivery
pipe.
Clean.
Valve clearance out of adjustment. Adjust.
Engine noisy (Excessive
valve chatter)
Too large valve clearance. Adjust.
Weakened or broken valve springs. Replace.
Worn tappet or cam surface. Replace.
Worn or burnt camshaft journal. Replace.
Engine noisy (Noise
seems to come from
piston)
Worn down piston or cylinder. Replace.
Combustion chamber fouled with
carbon.
Clean.
Worn piston pin or piston pin bore. Replace.
Worn piston ring or ring groove. Replace.
Engine noisy (Noise
seems to come from cam
chain)
Stretched cam chain. Replace.
Worn sprockets. Replace.
Cam chain tension adjuster not working. Repair or replace.
Engine noisy (Noise
seems to come from
crankshaft)
Rattling bearings due to wear. Replace.
Worn and burnt journal bearings. Replace.
Worn and burnt crank pin bearing. Replace.
Engine noisy (Noise
seems to come from
clutch)
Worn or splines of countershaft or clutch
sleeve hub.
Replace.
Worn teeth of clutch plates. Replace.
Distorted clutch plates. Replace.
Worn clutch release bearing. Replace.
Engine noisy (Noise
seems to come from
transmission)
Worn or rubbing gears. Replace.
Worn splines. Replace.
Worn or rubbing primary gears. Replace.
Worn bearings. Replace.
Engine noisy (Noise
seems to come from
water pump)
Worn or damaged impeller shaft. Replace.
Worn or damaged mechanical seal. Replace.
Contact between pump case and
impeller.
Replace.
Condition Possible cause Correction / Reference Item
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