Shindaiwa 89302 Owner's/Operator's Manual page 19

Troubleshooting Guide (continued)
What To Check
Is the engine
overheating?
Engine is rough at all
speeds. May also have
black smoke and/or
unburned fuel at the
exhaust.
Engine is knocking.
LOW POWER
Possible Cause
Operator is overworking the unit.
Carburetor mixture is too lean.
Improper fuel ratio.
Fan, fan cover, cylinder fins dirty or
damaged
Carbon deposits on the piston or in the
muffler.
Clogged air cleaner element.
Loose or damaged spark plug.
Air leakage or clogged fuel line.
Water in the fuel.
Piston seizure.
Faulty carburetor and/or diaphragm
Overheating condition.
Improper fuel.
Carbon deposits in the combustion
chamber.
Remedy
Operate at slower rate.
Shorten trimmer line.
Consult with an authorized
servicing dealer.
Refill with fresh, clean unleaded gasoline with
a pump octane of 87 or higher mixed with a
2-cycle mixing oil that meets or exceeds ISO-
L-EGD and/or JASO FD classified oils at 50:1
gasoline/oil ratio.
Clean, repair or replace as necessary.
Consult with an authorized servicing
dealer
Clean or replace the air filter
Tighten or replace the spark plug.
Restart. Check the Specifications page
in this manual for the correct spark
plug for this unit.
Repair or replace fuel filter and/or
fuel line.
Refill with fresh fuel/oil mixture.
Consult with an authorized
servicing dealer.
Consult with an authorized
servicing dealer.
Check fuel octane rating; check for
presence of alcohol in the fuel. Refuel
as necessary.
Consult with an authorized
servicing dealer.
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