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32 TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
If the engine malfunctions, carefully examine the symptoms and the operating conditions, and use the table
below as a guide to troubleshooting.
Symptom Probably Cause
Remedy
Faulty pistons, cylinders, piston rings,
and head gaskets
Faulty valves
K
Loose spark plugs
Insufficient
compression
Loose cylinder head bolts
Tighten properly
No fuel in fuel tank Fill fuel tank
Fuel valve not in “ON” position Open fuel valve lever.
Blocked fuel filter or tube Change fuel filter or fuel tube
Blocked air vent in tank cap
Clean fuel tank cap
No fuel to
combustion
chamber
Faulty carburetor K
Over rich fuel/air mixture Open choke.
Rotate engine with spark plugs
removed to discharge excess fuel.
Clean spark plugs.
Clogged air cleaner Clean
Faulty carburetor K
Incorrect grade/type of fuel
Engine won’t
start or output is
low
Spark plugs
fouled by fuel
Water in fuel
Change fuel
34
TROUBLESHOOTING GUIDE
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