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Troubleshooting Guide (continued)
Symptom
Poor acceleration.
Engine stops abruptly.
Engine difficult to shut off.
Top of engine is getting
dirty and oily.
Cutting attachment
rotates at engine idle.
Engine will not idle down.
Symptom
Excessive vibration.
Cutting attachment will
not rotate.
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ADDITIONAL PROBLEMS
Possible Cause
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.
ADDITIONAL PROBLEMS
Possible Cause
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged
liner.
Shaft not installed in powerhead or
gearcase.
Broken shaft.
Damaged gearcase.
Remedy
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 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.
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.
Remedy
Inspect and replace attachment as required.
Tighten gearcase securely.
Inspect and replace as necessary.
Inspect and reinstall as required.
Consult with an authorized servicing dealer.
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