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Situation
Starter handle
The crankshaft does
cannot be
not rotate
pulled
The plug does not
become wet with fuel
after repeated startup
operation
No spark
Startup is
impossible
Short-circuited due to foreign matter between the plug
electrodes
No compression
Weak spark
Idling stops
although
startup is
Low compression
possible
Good spark and
compression
TROUBLESHOOTING GUIDE
The piston ring is stuck.
The connecting rod bearing is
stuck
A valve is damaged
The crank gear or cam gear is
damaged
The fuel tank is empty
The fuel filter is clogged
The air hole in tank cap is faulty Replace the faulty part
The carburetor is clogged with
foreign matter
Throttle operation is
inappropriate
The spark plug is stained or
faulty
The spark plug cap is not
properly connected
The high-voltage cord or other
cable broke, or its connection is
faulty
The high-voltage cord or other
cable is grounded
The ignition coil broke or is
faulty
The piston ring is faulty
The piston is worn
A cam is damaged
The crank gear or cam gear is
damaged
Carbon accumulated on a
valve
The spark plug is stained or
faulty
The air gap between the
magneto rotor and ignition coil
is faulty
The piston ring is worn
Carbon accumulated on a
sealed valve surface
The idling speed is too low
The carburetor is clogged with
foreign matter
Cause
-6-
Measure
Disassemble the engine and
replace the faulty part
Replace the faulty part
Replace the faulty part
Replenish the fuel tank with
fuel
Clean or replace the part
Clean the part
Perform appropriate startup
operation
Clean or replace the part
Inspect and replace the part
Repair or replace the part
Repair the part
Replace the faulty part
Remove the foreign matter.
If this problem recurs often,
disassemble the engine and
clean the parts
Replace the faulty part
Clean the part
Clean or replace the part
Perform adjustment
Replace the faulty part
Clean the part
Perform adjustment
Disassemble the engine and
clean the part
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