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1. Troubleshooting and Correction
Situation Cause Measure
Starter handle
cannot be pulled.
The crankshaft does
not rotate.
Seizure of the piston ring
Seizure of the connecting
rod bearing
Disassembly and parts
replacement
No fuel in the tank Replenishment
Clogged fuel filter Cleaning or replacement
Faulty vent hole (check
valve) on the tank
Replacement
Dirt clogging the carburetor Cleaning
The plug does not
become wet with fuel
after repeated
starting operation.
Poor throttling Appropriate starting method
Dirty or faulty plug Cleaning or replacement
Improperly connected plug
cap
Inspection and replacement
Disconnected or improperly
connected high voltage cord
Repair or replacement
Ground connection of the
high voltage cord
Repair
No spark
Disconnected or faulty
ignition coil
Replacement
Short-circuited due to foreign matter between
the plug electrodes.
Removal of foreign matter: In
case of frequent occurrence,
disassemble and clean the
engine.
Faulty piston ring
Worn piston
Startup is
impossible.
No compression
Expired service life of the oil
seal
Parts replacement
Dirty or faulty plug Cleaning or replacement
Weak spark
Improper air gap Adjustment
Worn piston ring Replacement
Low compression
Expired service life of the oil
seal
Replacement
Idling stops
although startup is
possible.
Good spark and
compression
Revolutions too low for idling Adjustment
The engine stalls. Clogged fuel filter Cleaning or replacement
Muffler clogged with carbon
Clogged air cleaner
Cleaning
Starts, but when
accelerating …
Poor acceleration;
no increase in
revolutions
The chain brake is on. Release
Fluctuating
revolutions at high
speed
Dirt clogging the high-speed
fuel line
Cleaning
Starts, but …
Excessive fuel
consumption
Clogged air cleaner Cleaning
No oil in the tank Replenishment
Clogged oil filler port
Clogged oil filler port on the
guide bar
Chain oil is not discharged.
Clogged oil filter
Cleaning
TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
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