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Poor acceleration.
Clogged air filter.
Clogged fuel filter.
Lean fuel/air mixture.
Idle speed set too low.
Clean the air filter.
Replace the fuel filter.
Consult with an authorized servicing dealer.
Adjust: 3,000 (±300) RPM (min
-1
).
Symptom Possible Cause Remedy
Engine stops abruptly.
Switch turned off.
Fuel tank empty.
Clogged fuel filter.
Water in the fuel.
Shorted spark plug or loose terminal.
Ignition failure.
Piston seizure.
Reset the switch and restart.
Refuel. See page 7.
Replace fuel filter.
Drain; replace with clean fuel. See page 7.
Clean and replace spark plug, tighten
the terminal.
Replace the ignition unit.
Consult with an authorized servicing dealer.
Engine difficult to shut off.
Ground (stop) wire is disconnected or
switch is defective.
Overheating due to incorrect spark plug.
Overheated engine.
Test and replace as required.
Idle engine until cool.
Clean and regap the plug to 0.024 - 0.028
inch (0.6 - 0.7 mm). Correct plug: NGK CMR5H
or equivalent resistor type spark plug of the
correct range.
Idle engine until cool.
Cutting attachment
rotates at engine idle.
Engine idle too high.
Broken clutch spring or worn clutch
spring boss.
Loose attachment holder.
Set idle: 3,000 (±300) RPM (min
-1
).
Replace spring/shoes as required, check
idle speed.
Inspect and re-tighten holders securely.
Engine will not idle down.
Engine idle set too high.
Engine has an air leak.
Set idle: 3,000 (±300) RPM (min
-1
).
Consult with an authorized servicing dealer.
Top of engine is getting
dirty and oily.
Valve cover is leaking. Consult with an authorized servicing dealer.
Troubleshooting Guide (continued)
ADDITIONAL PROBLEMS
ADDITIONAL PROBLEMS
Symptom Possible Cause Remedy
Excessive vibration.
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged
liner.
Inspect and replace attachment as required.
Tighten gearcase securely.
Inspect and replace as necessary.
Cutting attachment will
not rotate.
Shaft not installed in powerhead or
gearcase.
Broken shaft.
Damaged gearcase.
Inspect and reinstall as required.
Consult with an authorized servicing dealer.