12
．
TROUBLESHOOTING
12.1 Gasoline Engine
(1) Starting problems
(2) Operation problems
(3) Recoil starter problems
21
Fuel is supplied, but
the igniter plug does
not ignite.
Electricity reaches
the high voltage cable.
Electricity does not
reach the high
voltage cable.
Bridging the igniter plug.
Carbon accumulated on the igniter plug.
Short circuit due to insulation problems of
the igniter plug.
Inappropriate spark gap
Short circuit of the ON-OFF switch
Ignition coil problems
Dirt of the point or inappropriate gap.
Breakage of ignition coil or short circuit
The wrong fuel is used.
Mixing of water or foreign materials
The air cleaner not working
Intake/exhaust valve is stuck or pushed up
Piston ring, cylinder wear
Cylinder head, igniter plug tightening problem
Head gasket, igniter plug gasket breakage
Dirt of air cleaner.
Carbon accumulated in the cylinder.
Carburetor oil level inappropriate.
Compression is
good,
No fuel in the fuel tank.
Fuel cock does not open properly.
Clogging of fuel filter.
Clogging of tank cap air hole
Air trapped in the fuel pipe.
Compression is
not good,
Fuel supplied, and
the igniter plug
ignites.
Fuel does not reach
the carburetor.
Compression is
good and no firing
problem.
Insufficient compression (see the item “compression is not good.” )
Compression is
good, but no firing.
Water mixed in fuel
Dirt of the igniter plug.
Ignition coil problem
Occasional short circuit of the ignition coil
Lowered power.
Engine overheating
Carbon accumulated inside combustion chamber and exhaust hole.
Spark plug thermal value inappropriate
Dirt and breakage of the cooling fin.
Revolution fluctuation
Governor adjustment inappropriate
Governor spring problems
Fuel does not flow properly.
Air taken from intake pipe system
Recoil starter operation not good
Clogging of foreign materials at the rotating part.
Weakening of the spiral spring
