Kohler COMMAND CH18-745 User Manual download pdf (Page 37)

5.4

Section 5

Fuel System and Governor

Carburetor

General

These engines are equipped with fixed main jet

carburetors manufactured by Keihin to Kohler

specifications. Most have automatic chokes and fuel

shut-off solenoids. Keihin carburetors with accelerator

pump features are standard on many models, and are

furnished as an option on other CH applications where

improved performance is required during periods of

rapid acceleration. Both types are almost identical

except for the accelerator pump parts shown in the

inset in Figure 5-8. Most information in the following

pertains to both type carburetors, with differences

pointed out or shown wherever pertinent.

WARNING: Explosive Fuel

Gasoline is extremely flammable and its vapors can

explode if ignited. Store gasoline only in approved

containers, in well ventilated, unoccupied buildings,

away from sparks or flames. Do not fill the fuel tank

while the engine is hot or running, since spilled fuel

could ignite if it comes in contact with hot parts or

sparks from ignition. Do not start the engine near

spilled fuel. Never use gasoline as a cleaning agent.

Troubleshooting - Carburetor Related Causes

Condition

Possible Cause/Probable Remedy

1. Low idle fuel mixture (some models)/speed improperly adjusted.

Adjust the low idle speed tab, 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 (some models).

d. Float level is set too high. Separate carburetor air horn from

carburetor body, adjust float according to steps 4 and 5 on page

5.7.

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 (some models).

b. Float level is set too low. Separate carburetor air horn from

carburetor body, adjust float according to steps 4 and 5 on page

5.7.

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 level set too high. 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 CH18-745 User Manual Page 37

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