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1. Troubleshooting and correction
Problem
Cause
Action
Starter grip cannot
be pulled.
Crank shaft does not
turn.
Seized piston ring
Disassemble and
replace.
Seized connecting rod bearing
Crank shaft turns.
Defective starter
Engine does not
start.
Dry spark plug
Empty fuel tank
Replenish with fuel.
Clogged fuel filter ass’y
Clean or replace.
Folded or improperly connected or
damaged fuel pipe
Check or replace.
Defective air vent valve of
tank cap ass’y
Replace.
Clogged carburetor ass’y
Clean.
Defective carburetor ass’y
Check or replace.
No spark
Stained or defective spark plug
Clean or replace.
Improperly connected high tension
cable and terminal
Check.
Damaged high tension cable
Replace.
Improper air gap
Adjust.
Defective coil
Replace.
Defective stop switch
Replace.
Improperly connected or damaged
internal wires
Check or replace.
No compression
Defective piston ring
Replace.
Worn piston
Defective oil seal of crank chamber
Engine starts but
cannot continue
idling.
Weak sparking
Stained or defective spark plug
Clean or replace.
Improper air gap
Adjust.
Defective coil
Replace.
Weak compression
Defective piston ring
Replace.
Defective oil seal of crank chamber
Proper sparking and
compression
Clogged carburetor ass’y
Clean.
Defective carburetor ass’y
Check or replace.
Clogged fuel filter ass’y
Clean or replace.
Folded or improperly connected or
damaged fuel pipe
Check or replace.
Too low idling speed
Adjust.
Engine starts and
accelerates but ...
Engine stops.
Clogged carburetor ass’y
Clean.
Defective carburetor ass’y
Check or replace.
Clogged fuel filter ass’y
Clean or replace.
Accelerates
improperly. (Engine
does not rev up.)
Defective carburetor ass’y
Check or replace.
Muffler clogged with carbon
Clean.
Clogged element of air cleaner ass’y
Clean.
Engine starts
but ...
Engine speed
fluctuates.
Clogged carburetor ass’y
Clean.
Defective carburetor ass’y
Check or replace.
Consumes excessive
fuel.
Defective carburetor ass’y
Check or replace.
Clogged element of air cleaner ass’y
Clean.
Cutting attachment
rotates at idling
speed.
Improper idling adjustment
Adjust.
Worn clutch section
Replace.
TROUBLESHOOTING GUIDE