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Additional Problems
Poor acceleration.
Idle speed set too low.
Consult with an authorized servicing dealer.
Symptom Possible Cause Remedy
Engine stops abruptly.
Engine difficult to shut
off.
Excessive vibration.
Chain rotates at idle
speed.
Broken clutch spring or worn clutch spring boss
Warped or damaged sprocket, chain, or bar.
Bent crankshaft.
Clean or replace the air filter.
Replace the fuel filter.
Inspect and/or test brake. Consult with an
authorized servicing dealer.
Consult with an authorized servicing dealer.
Adjust: 2,750(±250) min
-1
.
Reset the switch and restart.
Refuel. See section on “Filling the Tank with Fuel”.
Replace fuel filter.
Drain; replace with clean fuel. See section on
“Filling the Tank with Fuel”.
Clean or replace spark plug. See “Specifications” for
the correct plug for your unit. Tighten the terminal.
Replace the ignition unit.
Consult with an authorized servicing dealer.
Test and replace as required.
Replace spark plug. See “Specifications”
for the correct plug for your unit.
Idle engine until cool.
Replace spring/shoes as required, check idle
speed. Set idle: 2,750(±250) min
-1
Inspect and replace chain components as required.
Engine idle too high.
Overheated engine
Overheating due to incorrect spark plug.
Ground (stop) wire is disconnected, or switch
is defective.
Piston seizure.
Clogged air filter.
Switch turned off.
Fuel tank empty.
Clogged fuel filter.
Water in the fuel.
Shorted spark plug or loose terminal.
Ignition failure.
Clogged fuel filter.
Chain brake engaged.
Lean fuel/air mixture.
Troubleshooting Guide (continued)