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Check and Adjustment: Check ignition timing
Fault Condition: Abnormal
Probable Causes: • Faulty pulse generator
• Faulty CDI unit
Check and Adjustment: Test cylinder compression
Fault Condition: Abnormal
Probable Causes: • Leaking head gasket
• Worn cylinder and piston rings
Check and Adjustment: Check Carburetor
Fault Condition: Clogged
Probable Causes: • Needs Cleaned
Check and Adjustment: Check spark plug
Fault Condition: Fouled or discolored
Probable Causes: • Clean the spark plug
• Spark plug is incorrect heat range
Check and Adjustment: Check engine for overheating
Fault Condition: Overheating
Probable Causes: • Excessive carbon deposited in combustion chamber
• Wrong type of fuel
• Fuel / air mixture ratio is lean
• Use of poor quality fuel
Check and Adjustment: Accelerate or run at high speed
Fault Condition: Knocks
Probable Causes: • Worn piston and cylinder
• Fuel / air mixture ratio is lean
• Wrong type of fuel
• Ignition timing too advanced
• Excessive carbon deposited in combustion chamber
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