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1. Troubleshooting and correction
Problem
Cause
Corrective action
Starter handle
cannot be
pulled.
The crank shaft
does not rotate.
The piston ring is stuck.
The connecting rod bearing is stuck.
Disassemble the engine and
replace the faulty part.
A valve is damaged.
Replace the faulty part.
The crank gear or cam gear is
damaged.
Replace the faulty part.
The magneto rotor touches the
ignition coil.
Perform adjustment.
Startup is
impossible.
The plug does not
become wet with
fuel after repeated
startup operation.
The fuel tank is empty.
Replenish the fuel tank with
fuel.
The fuel filter is clogged.
Clean or replace the part.
The air hole in tank cap is faulty.
Replace the faulty part.
The carburetor is clogged with
foreign matter.
Clean the part.
Throttle operation is inappropriate.
Perform appropriate startup
operation.
No spark
The spark plug is stained or faulty.
Clean or replace the part.
The spark plug cap is not properly
connected.
Inspect and replace the part.
The high-voltage cord or other
cable broke, or its connection is
faulty.
Repair or replace the part.
The high-voltage cord or other
cable is grounded.
Repair the part.
The ignition coil broke or is faulty.
Replace the faulty part.
Short-circuited due to foreign matter between the plug
electrodes.
Remove the foreign matter.
If this problem recurs often,
disassemble the engine and
clean the parts.
No compression
The piston ring is faulty.
Replace the faulty part.
The piston is worn.
A cam is damaged.
The crank gear or cam gear is
damaged.
The valve is damaged.
Carbon accumulated on a valve.
Clean the part.
Idling stops
although
startup is
possible.
Weak spark
The spark plug is stained or faulty.
Clean or replace the part.
The air gap between the magneto
rotor and ignition coil is faulty.
Perform adjustment.
Low compression
The piston ring is worn.
Replace the faulty part.
Carbon accumulated on a sealed
valve surface.
Clean the part.
Good spark and
compression
The idling speed is too low.
Perform adjustment.
The carburetor is clogged with
foreign matter.
Disassemble the engine and
clean the part.
TROUBLESHOOTING GUIDE
