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1. GENERAL INFORMATION
C. Engine runs sluggish (especially in low speed and idling)
Check and adjustment
Fault condition
Probable causes
Check ignition timing (using
ignition lamp)
Normal
Abnormal
●
Incorrect ignition timing (malfunction of
CDI or AC alternator)
Adjust the air screw of
carburetor
Good
Poor
Air sucked through carburetor
gasket
No air sucked
Air sucked
Remove spark plug, install spark
plug into spark plug cap and
perform spark test against
engine ground
Good spark
Poor
D. Engine runs sluggish (High speed)
●
Rich mixture (loosen the screw)
●
Lean mixture (tighten the screw)
●
Poor heat insulation gasket
●
Carburetor lock loose
●
Poor intake gasket
●
Poor carburetor O-ring
●
Vacuum hose crack
●
Spark plug fouled
●
Malfunction of CDI
●
Malfunction of AC generator
●
Malfunction of ignition coil
●
Open or short circuit in spark plug leads
●
Malfunction of main switch
Check and adjustment
Fault condition
Probable causes
Check ignition timing
Normal
Abnormal
●
Malfunction of CDI
●
Malfunction of AC alternator
Check for fuel supplying system
in automatic fuel cup
Good
Abnormal
●
Insufficient fuel in fuel tank
●
Fuel filter clogged
●
Restricted fuel tank vent
Check if carburetor clogged
No clogged
Clogged
●
Cleaning
1-16
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