Check Carburetion
Before making a carburetion check, be sure the fuel tank has an ample supply of fresh, clean gasoline.
Be sure the shutoff valve, if equipped, is open and fuel flows freely through the fuel line. If fuel
fails to flow or is slow, check for plugged fuel cap vent, fuel line restriction or plugged fuel filter.
Be sure throttle and choke controls are properly adjusted.
If engine cranks but will not start, remove and inspect the spark plug.
If plug is wet, look for:
Over choking
Excessively rich fuel mixture
Water in fuel
Float needle valve stuck open
Plugged air cleaner
Fouled spark plug
If plug is dry, look for:
Leaking carburetor or intake manifold gaskets
Gummy or dirty carburetor, fuel filter, fuel lines or fuel tank
Float needle valve stuck closed
Inoperative fuel pump (if equipped)
Inoperative fuel shut off solenoid (if equipped)
A simple check to determine if the fuel is getting
to the combustion chamber through the carburetor is to remove the spark plug and pour
a small quantity of gasoline through the spark plug hole. Replace the plug. If the engine fires a
few times and then stops, look for the same conditions as for a dry plug.
Testing Fuel Shut Off Solenoid
The fuel shut off solenoid is controlled by the equipment ignition switch. With the switch OFF,
the solenoid plunger closes, stopping the fuel flow at the fixed main jet. With the switch in the
ON and START positions, the solenoid plunger opens, allowing normal fuel flow. If operating
properly, the solenoid will click when the switch is turned ON and OFF.
Check Compression..!
Possible Causes for Poor Compression:
• Loose cylinder head bolts
• Blown head gasket
• Burned valves, valve seats and/or loose
valve seats
• Insufficient tappet clearance
• Warped cylinder head
• Warped valve stems
• Worn bore and/or rings
• Broken connecting rod