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1. GENERAL INFORMATION
B. Engine run sluggish (Speed does not pick up, lack of power)
Check and adjustment
Fault condition
Probable causes
.
Try gradual acceleration and
check engine speed
Engine speed can be
increased.
Check ignition timing (Using
ignition lamp)
Engine speed can not be
increased.
●
Air cleaner clogged
●
Poor fuel supply
●
Lines in fuel tank evaporation
system clogged
●
Exhaust pipe clogged
●
Fuel nozzle clogged in carburetor.
●
Fuel nozzle clogged in carburetor.
Ignition timing correct
Incorrect ignition timing
●
Malfunction of CDI
●
Malfunction of AC alternator
Check cylinder compression
pressure (using compression
pressure gauge)
Compression pressure
correct
Check if carburetor jet is
clogged
No compression pressure
●
Cylinder & piston ring worn out
●
Cylinder gasket leaked
●
Sand hole in compression parts
●
Valve deterioration
●
Seized piston ring
No clogged
Clogged
●
Remove foreign
Remove spark plug
No foul or discoloration
Fouled and discoloration
Check if engine over heat
Normal
Engine overheat
Continually drive in acceleration
or high speed
No knock
Knock
●
Remove dirt
●
Incorrect spark plug heat range
●
Piston and cylinder worn out
●
Lean mixture
●
Poor fuel quality
●
Too much carbon deposited
in combustion chamber
●
Ignition timing too advanced
●
Poor circuit on the cooling system
●
Too much carbon deposited
in combustion chamber
●
Lean mixture
●
Poor fuel quality
●
Ignition timing too advanced
1-13
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