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Check and Adjustment: Continually drive in acceleration or high speed.
Fault Condition: Engine Knocking
Probable Causes: • Too much carbon deposited in combustion chamber
• Lean mixture
• Poor fuel quality
• Ignition timing too advanced
C. Engine runs Sluggish at low speeds or idling
Check and Adjustment: Check ignition timing using ignition lamp
Fault Condition: Abnormal
Probable Causes: • Incorrect ignition timing (malfunction of CDI or AC alternator)
Check and Adjustment: Adjust the air screw of the carburetor.
Fault Condition: Poor engine performance
Probable Causes: • Rich mixture (tighten the screw)
• Lean mixture (loosen the screw)
Check and Adjustment: Air leak through carburetor gasket
Fault Condition: Air leak
Probable Causes: • Bad heat insulation gasket
• Carburetor loose
• Bad intake gasket
• Bad carburetor O-ring
• Vacuum hose leak
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