
35
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 discon-
nected, 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 to 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 min
-1
RPM.
Reset the switch and re-start.
Refuel.
Replace the fuel filter.
Drain; replace with clean fuel.
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 at 0.6 0.7mm.
Correct plug: NGK CMR5H or equivalent
resistor type spark plug of the correct heat
range.
Idle engine until cool.
Consult with an authorized servicing dealer.
Set idle: 3,000 min
-1
RPM.
Replace spring/shoes as required,
check idle speed.
Inspect and retighten holders securely.
Set idle: 3,000 min
-1
RPM.
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
Troubleshooting Guide
(continued)
Engine stops abruptly.
Engine difficult to
shut off.
Top of engine is getting
dirty and oily.
Cutting attachment
rotates at engine idle..
Engine with not
idle down.
Excessive vibration.
Cutting attachment will
not rotate.