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SERVICE MANUAL
Check and Adjustment: Check ignition timing using ignition timing light.
Fault Condition: Incorrect engine timing.
Probable Causes: • Malfunction of CDI
• Malfunction of AC alternator
Check and Adjustment: Check cylinder compression pressure (using compression pressure
gauge)
Fault Condition: No compression pressure
Probable Causes: • Cylinder & piston ring worn out
• Cylinder gasket leaked
• Valve deterioration
• Seized piston ring
Check and Adjustment: Check to see if carburetor jet is clogged.
Fault Condition: Clogged
Probable Causes: Remove foreign object
Check and Adjustment: Remove spark plug.
Fault Condition: Fouled or Discolored
Probable Causes: • Remove dirt
• Incorrect spark plug heat range
Check and Adjustment: Check to see if the engine is overheating
Fault Condition: Engine Overheating
Probable Causes: • 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
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