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Problem and possible cause Remedy
1. Insufficient compression 1) Loosen spark plug Retighten; replace gasket
2) Leakage from cylinder head gasket Retighten; replace gasket
3) Piston ring seizure or wear Replace
4) Piston or cylinder wear Repair or replace
5) Incorrect valve and seat contact Repair or replace
6) Valve stem seizure Repair or replace
7) Improper valve clearance Adjust
2. Ignition system problems
1) Faulty spark plug Replace
2) Faulty ignition coil Replace
3) Improper air gap between ignition coil and
flywheel
Adjust
4) Demagnetization (flywheel magneto) Replace
3. Fuel system malfunction
1) Carburetor clogged Overhaul, clean
2) Fuel strainer and/or hose clogged Clean or replace
3) Air in fuel lines Check and retighten joints
4) Poor quality gasoline or water in gasoline Replace
4. Low air intake volume
1) Air cleaner clogged Clean or replace
2) Throttle valve malfunction Repair or replace
1. Engine 1) Cooling air flow obstructed at inlet or cylinder
baffle portion
Clean
2) Poor quality engine oil Replace
3) Lean fuel/air mixture
Check and adjust
carburetor
4) Excessive back pressure of exhaust system Check and clean or replace
5) Overloading Adjust to rated load
1. Carburetor system
1) Low idling speed Adjust
2) Slow system passage clogged Check and clean
2. Intake system
1) Air mixing from air intake system joints
Check and tighten;
replace gasket
3. Cylinder head
1) Gasket faulty (blow-by) Replace
4. Valve system
1) Improper valve clearance Adjust
2) Leakage from valve seat Repair
3) Excessive clearance between valve stem and
guide
Replace
5. Ignition system
1) Weak spark
Check; adjust or replace
plug
Poor output
OverheatRough Idling