Troubleshooting
20-2
Engine output Insufficient
1. Gently accelerate engine. Engine speed does not (1) Air cleaner clogged
increase sufficiently (2) Insufficient fuel supply
(3) Fuel tank cap air hole clogged
(4) Muffler clogged
2. Check ignition timing. Abnormal (1) Faulty CDI unit
(2) Faulty A.C. generator
3. Press the kick starter pedal to Low (1) Cylinder and piston ring worn
check the cylinder pressure. (2) Cylinder head gasket damaged
(3) Cylinder and cylinder head cracked
4. Check the carburetor for clogging Clogged (1)
Unsatisfactory Carburetor maintenance
5. Remove spark plugs Contaminated or (1) Unsatisfactory plug maintenance
discolored (2) Plugs with incorrect heat value used
6. Check for engine overheating Overheated (1) Cylinder or piston worn
(2) Lean fuel mixture
(3) Poor quality fuel used
(4) Carbon deposit inside the
combustion chamber excessive
(5) Ignition timing incorrect.
7. Accelerate suddenly or run at Engine knocks (1) Carbon deposit inside the
combustion chamber excessive
(2) Poor quality fuel used
(3) Lean fuel mixture
Engine speed increases.
Normal
Normal
Not clogged.
Not contaminated or discolored.
Not overheated.
Engine does not knock.
Cause of Trouble
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