Troubleshooting The Engine - McCulloch MS354 User Manual

For Parts Call 606-678-9623 or 606-561-4983 For Parts Call 606-678-9623 or 606-561-4983
PROBLEM
Unit won't start or starts but will
not run.
Unit starts, but engine has low
power.
Engine hesitates.
No power under load.
Runs erratically.
Smokes excessively.

9 - TROUBLESHOOTING THE ENGINE

PROBABLE CAUSE
Incorrect starting procedures.
Incorrect carburetor mixture
adjustment setting.
Fouled spark plug
Fuel filter plugged.
Incorrect lever position on choke.
Dirty spark arrester screen.
Dirty air filter.
Incorrect carburetor mixture
adjustment setting.
Incorrect carburetor mixture
adjustment setting.
Incorrectly gapped spark plug.
Incorrect carburetor mixture
adjustment setting.
Incorrect fuel mixture.
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Follow instructions in the User Manual.
Have carburetor adjusted by an
Authorized Service Center.
Clean / gap or replace plug.
Replace fuel filter.
Move to RUN position.
Replace spark arrester screen.
Remove, clean and reinstall filter.
Have carburetor adjusted by an
Authorized Service Center.
Have carburetor adjusted by an
Authorized Service Center.
Clean / gap or replace plug.
Have carburetor adjusted by an
Authorized Service Center.
Use properly mixed fuel (40:1 mixture).
20
CORRECTIVE ACTION