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Troubleshooting Guide (continued)
ADDITIONAL PROBLEMS
Poor acceleration.
Clogged air filter.
Clogged fuel filter.
Lean fuel/air mixture.
Idle speed set too low.
Switch turned off.
Fuel tank empty.
Clogged fuel filter.
Water in the fuel.
Shorted spark plug or loose terminal.
Ignition failure.
Piston seizure.
Ground (stop) wire is disconnected,
or switch is defective.
Overheating due to incorrect spark plug.
Overheated engine.
Valve cover is leaking.
Engine idle too high.
Broken clutch spring or worn clutch spring boss.
Loose attachment holder.
Engine idle set too high.
Engine has an air leak.
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged bushings.
Trimmer line not wound properly on spool.
Shaft not installed in powerhead or gearcase.
Broken shaft.
Damaged gearcase.
Clean the air filter.
Replace the fuel filter.
Consult with an authorized servicing dealer.
Adjust: 3,000 (±300) RPM (min
-1
).
Reset the switch and restart.
Refuel. See page 8.
Replace fuel filter.
Drain; replace with clean fuel. See page 8.
Clean or replace spark plug, tighten the terminal.
Replace the ignition unit.
Consult with an authorized servicing dealer.
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.
Consult with an authorized servicing dealer.
Set idle: 3,000 (±300) RPM (min
-1
).
Replace spring/shoes as required, check idle speed.
Inspect and re-tighten holders securely.
Set idle: 3,000 (±300) RPM (min
-1
).
Consult with an authorized servicing dealer.
Inspect and replace attachment as required.
Tighten gearcase securely.
Inspect and replace as necessary.
Rewind trimmer line.
Inspect and reinstall as required.
Consult with an authorized servicing dealer.
Symptom Possible Cause Remedy
Engine stops abruptly.
Engine difficult to shut off.
Excessive vibration.
Cutting attachment rotates at
engine idle.
Top of engine is getting
dirty and oily.
Cutting attachment will
not rotate.
Engine will not idle down.