18
Troubleshooting Guide
(continued)
ADDITIONAL PROBLEMS
Poor acceleration.
Clogged air filter.
Clogged fuel filter.
Chain brake engaged.
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
Engine idle too high.
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: 2,800 RPM min
-1
.
Reset the switch and restart.
Refuel. See page 8.
Replace fuel filter.
Drain; replace with clean fuel. See page 8.
Clean or replace spark plug with a NGK BPMR7A,
Tighten the terminal.
Replace the ignition unit.
Consult with an authorized servicing dealer.
Test and replace as required.
Replace spark plug with a NGK BPMR7A.
Idle engine until cool.
Set idle: 2,800 RPM min
-1
.
Replace spring/shoes as required, check idle speed.
Inspect and replace chain components as required.
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.
