-1-
Situation
Cause
Corrective action
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
startup operation.
Poor throttling
Proper startup 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;
disassemble and clean the
engine in case of frequent
occurrence.
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