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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 strainer.
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.
Engine idle too high.
Broken clutch spring or worn clutch spring boss.
Loose attachment holder.
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged bushings.
Shaft not installed in powerhead or gearcase.
Broken shaft.
Damaged gearcase.
Clean or replace the air filter.
Replace the fuel filter.
Consult with an authorized servicing dealer.
Adjust: 2,750 (±250) RPM (min
-1
).
Reset the switch and restart.
Refuel. See page 11.
Replace strainer.
Drain; replace with clean fuel. See page 11.
Clean or replace spark plug with a Champion CJ8 or
equivalent type spark plug of the correct heat range.
For EMC compliance, use NGK BMR6A. Tighten the
terminal.
Replace the ignition unit.
Consult with an authorized servicing dealer.
Test and replace as required.
Replace spark plug with a Champion CJ8 or equivalent
type spark plug of the correct heat range. For EMC
compliance, use NGK BMR6A.
Idle engine until cool.
Set idle: 2,750 (±250) RPM (min
-1
).
Replace spring/shoes as required, check idle speed.
Inspect and re-tighten holders securely.
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.
Symptom Possible Cause Remedy
Engine stops abruptly.
Engine difficult to shut off.
Excessive vibration.
Cutting attachment rotates at
engine idle.
Cutting attachment will
not rotate.