(1) Starting problem
Fuel is supplied, but
Spark Plug does
not ignite
Electricity reaches
to High Voltage Cable
Electricity does not
reach to High Voltage
Cable
Bridging Spark Plug
Carbon accumulated on Spark Plug
Short circuit due to insulation problems of
Spark Plug
Inappropriate gap of Spark Plug
Short circuit of Stop Switch
Ignition coil problems
The wrong fuel is used
Mixing of water or dust contamination
Air Cleaner not working
Intake/Exhaust Valve is stuck or pushed up
Piston Ring, Cylinder wear enough
Cylinder head, Spark Plug tightening problem
Head gasket or Spark Plug Gasket breaks
㻌
Dirt of Air Cleaner
Carbon accumulated in Cylinder.
Fuel Level in Carburetor inproper
Compression is
good
Compression is
not good
No fuel in tank
Fuel Cock does not open properly
Clogging of Fuel Filter
Clogging of Tank Cap Air Hole
Air trapped in fuel pipe
Fuel supplied, and
Spark Plug
ignites
Fuel does not reach
to Carburetor
(2) Operation problem
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 Spark Plug
Ignition Coil problem
Lowered power
Engine overheating
Carbon accumulated inside combustion chamber and exhaust hole.
Thermal value of Spark Plug is poor
Dirt and breakage of Cooling Fin
Revolution fluctuation
Governor adjustment inappropriate
Governor Spring problem
Fuel flows in proper
Air taken from Intake Pipe line
Clogging of Pilot Jet ( Idle speed fluctuates improper)
(3) Recoil Starter does not work well
Clogging of dust from rotating part
Weakening of Spiral Spring
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TROUBLESHOOTING
13.1 Gasoline Engine
