SERVICING INFORMATION 7-5
ENGINE LACKS POWER
ENGINE OVERHEATS
DIRTY OR HEAVY EXHAUST SMOKE
Symptom, possible causes and remedy
• Loss of valve clearance.
• Weakened valve springs.
• Valve timing out of adjustment.
• Worn piston rings or cylinder.
• Poor seating of valves.
• Fouled spark plug.
• Incorrect spark plug.
• Clogged carburetor jet.
• Insufficient spark plug gap.
• Air leakage from intake pipe.
• Incorrect float chamber fuel level.
• Clogged air cleaner element.
• Sucking air from carburetor or vacuum hose.
• Too much engine oil.
Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Adjust or replace.
Clean.
Regap or replace.
Tighten or replace.
Adjust float height.
Replace.
Retighten or replace.
Drain out excess oil.
Symptom, possible causes and remedy
• Heavy carbon deposit on piston head.
• Not enough oil in the engine.
• Use of incorrect engine oil.
• Low float chamber fuel level.
• Air leakage from intake pipe.
• Incorrect spark plug.
• Clogged exhaust pipe/muffler.
• Ignition timing too advanced due to defective tim-
ing.
Clean.
Add oil.
Change.
Adjust float height.
Tighten or replace.
Change.
Clean or replace.
Replace.
Symptom, possible causes and remedy
• Too much engine oil in the engine.
• Worn piston rings or cylinder.
• Worn valve guides.
• Scored or scuffed cylinder wall.
• Worn valves stems.
• Defective stem seal.
• Worn oil ring side rail.
Drain excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
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