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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
Broken/bent fuel pipe, faulty
connection
Repair
Faulty piston ring Cleaning/replacement
Worn piston ring Replacement
Worn piston Replacement
Worn or damaged oil seal
Replacement
Worn cylinder, cracks
Replacement
Repair flow chart
Remove the spark plug to check
for sparks. Sparks should be
generated.
Impossible to pull
O
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