Shindaiwa 89303 Owner's/Operator's Manual page 21

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.
Valve clearance set incorrectly.
Remedy
Operate at slower rate.
Consult with an authorized servicing
dealer.
Refill with clean fresh unleaded gasoline
with a pump octane of 87 or higher, mixed
with a premium 2-cycle mixing oil at a 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 section
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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