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troubleshooting

problem possible causes probable solutions

engine will not

start

fUEL RELATED:
No fuel in tank or Fuel Cock closed.1.
Choke not in start position, 2.
especially with cold engine.
Low quality or deteriorated, old 3.
gasoline.
Dirty fuel passageways blocking fuel 4.
ow.
Too much fuel in chamber. This can 5.
be caused by the carburetor needle
sticking.
fUEL RELATED:
Fill fuel tank and open fuel valve.1.
Move choke to start position if 2.
engine is cold.
Use only fresh 89+ octane unleaded 3.
gasoline.
Clean out passageways using 4.
fuel additive. Heavy deposits may
require further cleaning.
Turn choke to run position. Remove 5.
spark plug and pull the start handle
several times to air out the chamber.
Reinstall spark plug and set choke
to start position.
iGniTiOn (SpARk) RELATED:
Spark plug wire not connected 1.
securely.
Spark plug electrode wet or dirty.2.
Incorrect spark plug gap.3.
Spark plug wire or spark plug 4.
broken.
Incorrect spark timing or faulty 5.
ignition system.
iGniTiOn (SpARk) RELATED:
Connect spark plug wire properly. 1.
Clean spark plug.2.
Correct spark plug gap.3.
Replace spark plug wire and/or 4.
spark plug.
Have qualied technician diagnose/5.
repair ignition system.
COmpRESSiOn RELATED:
Cylinder not lubricated. Problem 1.
after long storage periods.
Loose or broken spark plug. 2.
(Hissing noise will occur when trying
to start.)
COmpRESSiOn RELATED:
Pour tablespoon of oil into spark 1.
plug hole. Crank engine a few times
and try to start again.
Tighten spark plug. If that does not 2.
work, replace spark plug.
Engine misres Spark plug wire loose.1.
Incorrect spark plug gap or 2.
damaged spark plug.
Defective spark plug wire.3.
Old or low quality gasoline.4.
Check wire connections.1.
Re-gap or replace spark plug. 2.
Replace spark plug wire.3.
Use only fresh 89+ octane unleaded 4.
gasoline.

engine stops

suddenly

Low oil shutdown. 1.
Fuel tank empty or full of impure or 2.
low quality gasoline.
Defective fuel tank cap creating 3.
vacuum, preventing proper fuel ow.
Fill engine oil to proper level. Check 1.
engine oil before EVERY use.
Fill fuel tank with fresh 89+ octane 2.
unleaded gasoline.
Test/replace fuel tank cap.3.

Follow all safety precautions whenever diagnosing or servicing the

equipment or engine.