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1. Troubleshooting and correction
Trouble
Cause
Corrective action
Starter
handle
cannot be
pulled.
The crank shaft does
not rotate.
Faulty piston ring
Disassemble and
replace.
Seized piston and cylinder
Faulty crank shaft bearings
Magneto rotor contact with ignition coil
The recoil starter
does not rotate.
Broken recoil starter
Inspect and replace.
Faulty starter pawl
Clogging of dirt in starter pawl
Clean.
Startup is
impossible.
No compression
Faulty piston ring
Replace.
Worn piston
Worn cylinder
Short-circuited due to foreign matter between the spark plug
electrodes.
Remove foreign matter:
In case of frequent
occurrence, disassemble
and clean the engine.
No spark
Stop switch not at startup position
Adjust to startup position.
Dirty or faulty spark plug
Clean or replace.
Improperly connected plug cap
Inspect and replace.
Disconnected or improperly connected
high voltage cord
Repair or replace.
Ground connection of high voltage
cord
Repair.
Disconnected or faulty ignition coil
ass’y
Replace.
Large gap between the magneto rotor
circumference and ignition coil ass’y
Adjust.
The spark plug does
not become wet with
fuel after repeated
starting operation.
No fuel in the fuel tank
Add properly mixed fuel
(25:1 to 50:1).
Clogged fuel filter
Clean or replace.
Faulty fuel pipe
Adjust, replace or
connect.
Faulty vent hole (inner cap) on the fuel
tank
Replace.
Faulty carburetor ass’y
Adjust, clean or replace.
The spark plug is wet
due to excessive fuel
supplied.
Pulling the starter handle several
times while the choke lever is at the
“startup” position.
Dry the spark plug.
Remove excessive fuel.
Idling stops
although
startup is
possible.
Weak spark
Dirty or faulty spark plug
Clean or replace.
Improper air gap
Adjust.
Low compression
Worn piston ring
Replace.
Worn piston
Worn cylinder
Good spark and
compression
Revolutions too low for idling
Adjust.
Poorly adjusted carburetor ass’y
Defective sealing of the packing
Replace.
TROUBLESHOOTING GUIDE
