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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.
16
ADDITIONAL PROBLEMS
LOW POWER OUTPUT
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.
Valve clearance set incorrectly.
Overheating condition.
Improper fuel.
Carbon deposits in the combustion
chamber.
Valve clearance set incorrectly.
Remedy
Cut at a slower rate.
Consult with an authorized servicing dealer.
Refill with fresh, clean unleaded gasoline with
a pump octane of 87 or higher mixed with
a -cycle air cooled mixing oil that meets or
exceeds ISO-L-EGD and/or JASO FC classified
oils at 50:1 gasoline/oil ratio.
Clean, repair or replace as necessary.
Consult with an authorized servicing dealer.
Service the air cleaner element.
Tighten or replace.
Repair or replace filter and/or fuel line.
Replace the fuel. See page 8.
Consult with an authorized servicing dealer.
See above.
Check fuel octane rating; check for presence of
alcohol in the fuel (pg. 8). Refuel as necessary.
Consult with an authorized servicing dealer.
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