36 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
Engine won't start or
Insufficient
output is low
compression
No fuel to
combustion chamber
Spark plugs fouled
by fuel
TROUBLESHOOTING GUIDE
Probable Cause
Loose spark plugs
Faulty pistons, cylinders, piston
rings or head gaskets
Faulty valves
Loose cylinder head bolts
No fuel in fuel tank
Fuel valve is not in "ON" position.
Clogged fuel filter or tube
Clogged air vent in tank cap
Faulty fuel system
Clogged air cleaner
Incorrect grade/type of fuel
Water in fuel
Over-rich fuel/air mixture
Faulty fuel system
Remedy
Tighten properly
Fill fuel tank
Open fuel valve lever.
Change fuel filter or fuel tube
Clean fuel tank cap
Replace
Change fuel