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CORRECTIVE ACTION
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).
PROBLEM
Unit won’t start or starts but will not
r
un.
Unit starts, but engine has low
power.
Engine hesitates.
No power under load.
Runs erratically.
Smokes excessively.
PROBABLE CAUSE
Incorrect starting procedures.
Incorrect carb
uretor 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.
9 - TROUBLESHOOTING THE ENGINE
19
10 - PARTS LIST
20
MODEL MTD1640NAV/ MTD1640NAVCC