20-3
TROUBLESHOOTING
Engine speed does not
increase sufficiently.
Abnormal
Low
Clogged
Contaminated or
discolored.
Overheated
Engine knocking
POOR PERFORMANCE AT LOW SPEED AND IDLING
CAUSE OF TROUBLE
·Clogged air cleaner.
·Insufficient fuel supply.
·Clogged fuel tank cap air hole
·Clogged muffler.
·Faulty CDI unit.
·Faulty A.C generator.
·Worn cylinder or piston ring.
·Damaged cylinder head gasket.
·Cracked cylinder or cylinder head.
·Poor carburetor maintenance.
·Poor plug maintenance
·Using spark plug with an incorrect
heat range.
·Lean mixture.
·Worn cylinder or piston
·Lean fuel mixture
·Poor quality fuel being used.
·Excessive carbon build-up on
combustion chamber.
·Incorrect ignition timing.
·Damaged cooling fan.
·Excessive carbon build-up on
combustion chamber.
·Poor quality fuel being used.
·Lean fuel mixture.
Smoothly accelerate engine.
Check the ignition timing.
Strongly kick the starter pedal, and the
cylinder compression.
Check the carburetor for clogging.
Check the spark plug.
Check for engine overheating.
Accelerate suddenly or run at
Accelerate
Completion
Engine speed increases.
Normal
Normal
Not clogged
Not contaminated or not discolored.
Not overheated.
Engine does not knock.
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