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Troubleshooting Guide (continued)
Symptom
Poor acceleration.
Engine stops abruptly.
[Engine difficult to shut off._
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.
Top of engine is gettingdirty and oily.
Cutting attachment
rotates at engine idle.
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 will not idle down. ]-----,,+ Engine idle set t°° higlL
Engine has an air leak.
Remedy
Clean tile air filter.
Replace tile fuel filter.
Consult with an authorized servicing dealer.
Adjust: 3,000 (±300) RPM (mind).
Reset tile switch and restart.
Refuel. See page 10.
Replace fuel filter.
[)rain; replace with clean fuel. See page 10.
Clean and replace spark plug, tighten
tile terminal.
Replace tile ignition unit.
Consult with an authorized servicing dealer.
Test and replace as required.
Idle engine until cool.
Clean and regap tile plug to 0.024- 0.028
inch (0.6- 0.7 ram). Correct plug: NGK CMR5H
or equivalent resistor type spark plug of tile
correct range.
Idle engine until cool.
Consult with an authorized servicing dealer.
Set idle: 3,000 (±300) RPM (rain-l).
Replace spring/shoes as required, check
idle speed.
Inspect and re-tighten holders securely.
Set idle: 3,000 (±300) RPM (rain-l).
Consult with an authorized servicing dealer.
Symptom
I Excessive vibration.
Possible Cause
Warped or damaged cutting attachment.
Loose gearcase.
Bent main shaft/worn or damaged
bushings.
Trhnmer line not wound properly on spool. Rewind trhnmer line.
Cutting attachment will
not rotate.
Shaft not installed in powerhead or
gearcase.
Broken shaft.
Damaged gearcase.
Remedy
Inspect and replace attachment as required.
Tighten gearcase securely.
Inspect and replace as necessary.
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