Kohler Command CV730 User Manual download pdf (Page 43)

5.9

Section 5

Fuel System and Governor

Figure 5-6. Carburetor Adjustments.

2. Preliminary Settings: Turn the adjusting needle

out (counterclockwise) from lightly bottomed

2-1/4 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. The choke plate and shaft

assembly is spring loaded. Check to

make sure the plate moves freely and is

not binding, affecting idle fuel delivery.

4. Low Idle Speed Setting: Place the throttle control

into the “idle” or “slow” position. Set the low

idle speed to 1200 RPM* (± 75 RPM) by turning

the low idle speed adjusting screw in or out.

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. Low Idle Fuel Needle Setting: Place the throttle

into the “idle” or “slow” position. Turn the low

idle fuel adjusting needle in (slowly) until engine

speed decreases and then back out approximately

3/4 to 1 turn to obtain the best low speed

performance.

6. Recheck the idle speed using a tachometer and

readjust the speed as necessary.

Models with Governed Idle System

An optional governed idle control system is supplied

on some engines. The purpose of this system is to

maintain a desired idle speed regardless of ambient

conditions (temperature, parasitic load, etc.) that may

change. Engines with this feature contain a small

secondary spring connected between the governor

lever and the lower adjustment tab of the main

bracket. See Figure 5-7.

The system requires an additional procedure for

setting the idle speed. If speed adjustments are

required proceed as follows.

1. Make any necessary speed or control adjustments

following the appropriate instructions covered in

this section.

2. Move the throttle control to the idle position.

Hold the governor lever away from the

carburetor, or hold the throttle lever so it is tight

against the idle speed adjusting screw, to negate

the governor activation. See Figure 5-8. Check the

speed with a tachometer and adjust it to 1500

RPM.

3. Release the governor lever and allow the engine

to return to the governed idle speed. Check it

with a tachometer against the equipment

manufacturers recommended idle speed.

Governed Idle Speed (RPM) is typically 300 RPM

(approximate) higher than the low idle speed. If

adjustment is necessary, bend the adjusting tab on

the speed control assembly to set. See Figure 5-7.

Low Idle Fuel

Adjustment

(Some Models)

Low Idle Speed

(RPM) Adjustment

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.

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Kohler Command CV730 User Manual Page 43

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