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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.
Symptom Possible Cause Remedy
Engine stops abruptly.
Switch turned off.
Fuel tank empty.
Clogged fuel filter.
Water in fuel.
Shorted spark plug or loose terminal.
Ignition failure.
Piston seizure.
Reset the switch and and restart.
Refuel. See page 10.
Replace fuel filter.
Drain; replace with clean fuel. See page 10.
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 BPMR6A
or equivalent resistor type spark plug of the
correct range.
Idle engine until cool.
Cutting attachment rotates
at idle.
Engine idle too high.
Broken clutch spring or worn clutch
spring boss.
Loose attachment holder.
Engine will not idle down.
Engine idle set too high.
Engine has an air leak.
Clean the air filter.
Replace the fuel filter.
Consult with an authorized servicing dealer.
Adjust: 3,000 ( 250) RPM (min )
-1
Set Idle: 3,000 ( 250) RPM (min )
Replace spring/shoes as required, check
idle speed.
Inspect and re-tighten holders securely.
-1
Set Idle: 3,000 ( 250) RPM (min )
Consult with an authorized servicing dealer.
-1
ADDITIONAL PROBLEMS
Symptom Possible Cause Remedy
Excessive vibration.
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged
bushings.
Trimmer line not wound properly on spool.
Inspect and replace attachment as required.
Tighten gearcase securely.
Inspect and replace as necessary.
Rewind trimmer line.
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.