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1. General Information
C. Engine runs sluggish (especially in low speed and idling)
D. Engine runs sluggish (High speed)
Check and ad
ustment Fault condition Probable causes
Check ignition timing
(Using ignition lamp)
Check for fuel supplying
system in automatic fuel cup
Check if carburetor clogged
1. Incorrect ignition timing (malfunction
of CDI or AC alternator)
1. Rich mixture (loosen the screw)
2. Lean mixture (tighten the screw)
1. Poor heat insulation gasket
2. Carburetor lock loose
3. Poor intake gasket
4. Poor carburetor O-ring
5. Vacuum hose crack
1. Spark plug fouled
2. Malfunction of CDI
3. Malfunction of AC generator
4. Malfunction of ignition coil
5. Open or short circuit in spark plug
leads
6. Malfunction of main switch
1. Insufficient fuel in fuel tank
2. Fuel filter clogged
3. Restricted fuel tank vent
Good Poor
1. Malfunction of CDI
2. Malfunction of AC alternator
Normal Abnormal
Check and adjustment
Fault condition Probable causes
Check ignition timing
Good spark Poor
Remove spark plug, install
spark plug into spark plug
cap and perform spark test
against engine ground
No air sucked
Air sucked through
carburetor gasket
Good Poor
Adjust the air screw of
carburetor
Normal Abnormal
Air sucked
No clogged Clogged
1. Cleaning
1-15
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