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Broken piston ring
Replacement
Seized piston or cylinder
Replacement
Broken connecting rod needle
bearing
Replacement
Seized ball bearing
Replacement
Magneto rotor contact with ignition
coil
Adjustment
Broken starter
Inspection/replacement
Faulty startup pawl
Inspection/replacement
Stop switch not in the startup position
Setting to the startup
position
Dirty or faulty spark plug
Cleaning/inspection
Disconnected or improperly
connected high voltage cord and
other wiring
Inspection
Ground connection of the high
voltage cord and other wiring
Inspection
Disconnected or faulty ignition coil
Replacement
Excessive gap between magneto
rotor circumference and ignition coil
Adjustment
Clogged fuel filter
Cleaning/replacement
Cracked fuel pipe
Replacement
Faulty tank vent hole (check valve)
Replacement
Faulty pump diaphragm of the
carburetor
Replacement
Dirt clogging the carburetor
Cleaning
Faulty piston ring
Cleaning/replacement
Worn piston ring
Replacement
Worn piston
Replacement
Worn or damaged oil seal
Replacement
Clogged fuel filter
Cleaning
Inadequate warm-up, especially in
cold weather
Warm-up
Repair flow chart
Remove the spark plug to
check for sparks. Sparks are
generated.
No spark
Impossible to pull
Pull the recoil starter.
Pulling is possible when you
feel a slight compression.
Dry
Return the spark plug and plug
cap to the original positions, and
then perform proper startup
operation. Confirm that the tip of
the spark plug becomes wet with
fuel.
No compression
There is compression.
There is compression.
The engine stalls
The engine starts, but when the
throttle is pulled …
OK
OK
OK
OK
OK