Kohler COMMAND CH18-745 User Manual download pdf (Page 39)

5.6

Section 5

Fuel System and Governor

Figure 5-4. Pre-Compliance Carburetor with Low

Idle Adjustment.

1. With the engine stopped, turn the low idle fuel

adjusting needle in clockwise until it bottoms

lightly.

NOTE: The tip of the idle fuel adjusting needle is

tapered to critical dimensions. Damage

to the needle and the seat in the

carburetor body will result if the needle is

forced.

2. Now turn the adjusting needle out

counterclockwise 1-1/2 turns.

3. Start the engine and run at half throttle for 5 to 10

minutes to warm up. The engine must be warm

before making final settings. Check that the

throttle and choke plates can fully open.

NOTE: The carburetor has a self-relieving

choke. Choke plate and shaft assembly

is spring loaded. Check to make sure

plate moves freely and is not binding and

affecting idle fuel delivery.

4. Place the throttle control into the “idle” or “slow”

position. Turn the low idle speed adjusting screw

in or out to obtain a low idle speed of 1200 RPM

(± 75 RPM). Check the speed using a tachometer.

NOTE: The actual low idle speed depends on

the application. Refer to the equipment

manufacturer’s recommendations. The

low idle speed for basic engines is 1200

RPM. To ensure best results when

setting the low idle fuel needle, the low

idle speed should be 1200 RPM (± 75

RPM).

5. Turn the low idle fuel adjusting needle in (slowly)

until engine speed decreases and then back out

approximately 3/4 turn to obtain the best low

speed performance.

6. Recheck the idle speed using a tachometer and

readjust the speed as necessary.

Float

It is not necessary to remove the carburetor from the

engine to check and adjust the float.

1. Remove the air cleaner and breather hose. Refer

to Section 9 – ‘‘Disassembly”.

Carburetor Adjustments

General

In compliance with government emission standards,

the carburetor is calibrated to deliver the correct air-to-

fuel mixture to the engine under all operating

conditions. The high-speed mixture is preset and

cannot be adjusted. Pre-compliance carburetors

contain a low idle fuel adjusting needle, on “certified”

compliance carburetors, both the low and high speed

mixture circuits are pre-established and cannot be

adjusted. The low idle speed (RPM) is the only

adjustment available. See Figures 5-4 and 5-5.

Low Idle Speed

Adjustment

Low Idle Fuel

Adjusting Needle

Main Jet

Location

Figure 5-5. “Certified” Compliance Carburetor.

NOTE: Carburetor adjustments should be made only

after the engine has warmed up.

Adjusting Low Idle Speed and Fuel (Some Models)

To adjust the carburetor idle speed, see Figure 5-4 and

follow these steps.

Low Idle

Speed

Adjustment

Fuel Shut-Off

Solenoid (Main

Jet Location)

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Kohler COMMAND CH18-745 User Manual Page 39

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