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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 starter 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 flowchart
Remove the spark plug to
check for sparks. Proceed
when 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