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SERVICE MANUAL
Troubleshooting
A. Engine is hard to start or cannot be started
Check and Adjustment: Loosen carburetor drain bolt to see if there is gasoline inside the carburetor.
Fault Condition: If no fuel is supplied to carburetor then check the following probable
causes. IF FUEL SUPPLY IS SUFFICIENT CONTINUE TO NEXT CHECK AND
ADJUSTMENT.
Probable Causes: • Fuel tank valve turned off
• No fuel in fuel tank
• Check fuel lines, fuel tank, carburetor and intake vacuum.
• Float valve clogged
• Lines in fuel tank evaporation system clogged
• Malfunction of fuel pump
• Loosen or damaged fuel pump vacuum hose
• Fuel filter clogged
• Closed fuel tank cap
Check and Adjustment: Remove spark plug, install it into spark plug cap, and perform a spark test
against engine ground. Check to make sure it sparks properly. IF SPARK
PLUG IS FUNCTIONING PROPERLY CONTINUE TO NEXT CHECK AND
ADJUSTMENT.
Fault Condition: Weak sparks or no spark at all.
Probable Causes: • Malfunction of spark plug
• Spark plug foul
• Malfunction of CDI set
• Malfunction of AC generator
• Ignition coil is in open or short circuit
• Ignition coil leads open or short circuit
• Malfunction of main switch
Check and Adjustment: Perform cylinder compression test. IF CYLINDER COMPRESSION TEST IS
NORMAL CONTINUE TO NEXT CHECK AND ADJUSTMENT.
Fault Condition: Low Compression pressure or no pressure.
Probable Causes: • Piston ring seized
• Malfunction of cylinder valves
• Worn cylinder and piston ring
• Cylinder gasket leak
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