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Broken piston ring
Replace.
Seized piston or cylinder
Seized or broken needle bearing of the crank
shaft
Seized or broken ball bearing of the crank
shaft
Magneto rotor contact with ignition coil
Adjust.
Broken recoil starter
Inspect/replace.
Clogging of dirt in starter pawl
Clean.
Faulty piston ring
Clean/replace.
Worn piston ring
Replace.
Worn piston
Worn or broken oil seal
Worn cylinder
Defective sealing of the packing
Decompression valve trouble
Ignition failure due to contaminant
Clean (Remove contaminants.)
Stop switch not at startup position
Set to startup
position.
Dirty or faulty spark plug
Clean/inspect.
Improperly connected plug cap
Inspect/replace.
Disconnected or improperly connected high
voltage cord and other wiring
Ground connection of high voltage cord and
other wiring
Inspect.
Disconnected or faulty ignition coil
Replace.
Improper gap between magneto rotor
circumference and ignition coil
Adjust.
No fuel in fuel tank
Add properly mixed
fuel (25:1 to 50:1).
Clogged fuel filter
Clean/replace.
Bent fuel pipe
Adjust.
Cracked fuel pipe
Replace.
Disconnected fuel pipe
Connect.
Faulty tank vent hole (tank cap inside plug)
Replace.
Faulty pump diaphragm of carburetor ass’y
Dirt-clogged carburetor ass’y
Clean.
Poorly adjusted carburetor ass’y
Adjust.
Pulling the starter handle several times with
the choke button at the “startup” position
Dry the spark plug.
Remove residual fuel
from cylinder and
crank case.
Repair flowchart
Pull the starter handle.
Is pulling possible?
Remove the spark plug to
check for sparks.
Are sparks generated?
Is there compression?
Return the spark plug
and plug cap to the
original positions, and
then perform proper
startup operation.
Is the tip of the spark plug
wet with fuel?
Is the spark plug wet due
to excessive supply of
fuel?
No
Yes
Yes
Yes
Yes
Yes
Is there any foreign
matter between the spark
plug electrodes?
No
Yes
No
No
No
No