Kohler Command CV730 User Manual download pdf (Page 41)

5.7

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.

• Make sure the fuel tank is filled with clean, fresh

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

includes checking the fuel shut-off valve, fuel

tank filter screen, in-line fuel filter, fuel lines and

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 the

precleaner if equipped) is clean, and all air

cleaner components are fastened securely.

• Make sure the ignition system, governor system,

exhaust system, and throttle and choke controls

are operating properly.

If the engine is hard-starting, runs roughly or stalls at

low idle speed, it may be necessary to service the

carburetor.

Troubleshooting – Carburetor Related Causes

Condition Possible Cause/Probable Remedy

1. Low idle fuel mixture/speed improperly adjusted. Adjust the low

idle speed screw, then adjust the low idle fuel needle.

1. Engine starts hard, runs roughly

or stalls at idle speed.

2. Engine runs rich (indicated by

black, sooty exhaust smoke,

misfiring, loss of speed and power,

governor hunting, or excessive

throttle opening).

2a. Clogged air cleaner. Clean or replace.

b. Choke partially closed during operation. Check the choke lever/

linkage to ensure choke is operating properly.

c. Low idle fuel mixture is improperly adjusted. Adjust low idle

fuel needle.

d. Float level too high. Separate fuel bowl from carburetor body.

Free (if stuck), or replace float.

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.

g. Leaky, cracked, or damaged float. Submerge float to check for

leaks.

3. Engine runs lean (indicated by

misfiring, loss of speed and power,

governor hunting, or excessive

throttle opening).

3a. Low idle fuel mixture is improperly adjusted. Adjust low idle

fuel needle.

b. Float level too low. Separate fuel bowl from carburetor body. Free

(if stuck), or replace float.

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.

4a. Float stuck. See Remedy 2d.

b. Dirt under fuel inlet needle. See Remedy 2e.

c. Bowl vents plugged. Blow out with compressed air.

d. Carburetor bowl gasket leaks. Replace gasket.

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Kohler Command CV730 User Manual Page 41

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