Kohler Command Pro CV980 User Manual
Page 32
5.4
Section 5
Fuel System and Governor
Troubleshooting Checklist
When the engine starts hard, runs roughly or stalls
at low idle speed, check the following areas before
adjusting or disassembling the carburetor.
ȱ Ȋȱ ȱȱȱȱȱȱęȱ ȱǰȱȱ
gasoline.
•
Make sure the fuel tank cap vent is not blocked
and that it is operating properly.
•
Make sure fuel is reaching the carburetor. This
ȱȱȱȱȬěȱǰȱȱ
ȱęȱǰȱȬȱȱęǰȱȱȱȱ
fuel pump for restrictions or faulty components
as necessary.
•
Make sure the air cleaner base and carburetor are
securely fastened to the engine using gaskets in
good condition.
•
Make sure the air cleaner element (including
precleaner if equipped) is clean and all air cleaner
components are fastened securely.
•
Make sure the ignition system, governor system,
¡ȱ¢ǰȱȱĴȱȱȱȱ
are operating properly. If the engine is hard-
starting, runs roughly, or stalls at low idle speed,
it may be necessary to adjust or service the
carburetor.
Troubleshooting – Carburetor Related Causes
Condition
Possible Cause/Probable Remedy
ȱ ŗǯȱ ȱȱǰȱȱ¢ȱ
or stalls at idle speed.
ȱ ŗǯȱ ȱȱȱ¡ȱǻȱǼȦȱ¢ȱ
ǯȱȱȱ ȱȱȱǰȱȱȱȱ ȱȱ
fuel needle.
ȱ Řǯȱ ȱȱȱǻȱ¢ȱ
black, sooty exhaust smoke,
ęǰȱȱȱȱȱ ǰȱ
governor hunting, or excessive
ĴȱǼǯ
ȱŘǯȱ ȱȱǯȱȱȱǯ
ȱ ǯȱ ȱ¢ȱȱȱǯȱȱȱȱȦ
linkage to ensure choke is operating properly.
ȱ ǯȱ ȱȱȱ¡ȱȱ¢ȱǯȱȱ ȱȱ
fuel needle (some models).
d. Float level is set too high. Separate carburetor air horn from
ȱ¢ǰȱȱĚȱȱȱȱȱ
procedure.
e. Dirt under the fuel inlet needle. Remove needle; clean needle
and seat and blow with compressed air.
f. Bowl vent or air bleeds plugged. Remove low idle fuel adjusting
needle. Clean vent, ports, and air bleeds. Blow out all passages
with compressed air.
ȱ ǯȱ ¢ǰȱȱȱȱĚǯȱȱĚȱȱȱȱ
leaks.
ȱ řǯȱ ȱȱȱǻȱ¢ȱ
ęǰȱȱȱȱȱ ǰȱ
governor hunting or excessive
ĴȱǼǯȱ
ȱřǯȱ ȱȱȱ¡ȱȱ¢ȱǯȱȱ ȱȱ
fuel needle (some models).
b. Float level is set too low. Separate carburetor air horn from
ȱ¢ǰȱȱĚȱȱȱȱȱ
procedure.
c. Idle holes plugged; dirt in fuel delivery channels. Remove low
idle fuel adjusting needle. Clean main fuel jet and all passages;
blow out with compressed air.
4. Fuel leaks from carburetor.
ȱŚǯȱ ȱȱȱȱǯȱȱ¢ȱŘǯ
ȱ ǯȱ ȱȱȱȱǯȱȱ¢ȱŘǯ
c. Bowl vents plugged. Blow out with compressed air.
d. Carburetor bowl gasket leaks. Replace gasket.