Kohler Command CV20 Kullanıcı El Kitabı - Sayfa 16

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• Make sure fuel is reaching the carburetor. This

includes checking the fuel lines and fuel pump for

restrictions or faulty components, replace as

necessary.

• Make sure the air cleaner element is clean and all

air cleaner element components are fastened

securely.

If, after checking the items listed above, the engine is

hard to start, runs roughly, or stalls at low idle speed,

it may be necessary to adjust or service the

carburetor.

Adjust Carburetor

Models CV18-740

NOTE: Certified engines may have a fixed idle fuel

adjusting needle. Do not attempt steps 1 and 2

below. Proceed directly to step 3.

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

adjusting needle in (clockwise) until it bottoms

lightly.

NOTE: The tip of the low idle fuel adjusting

needle is tapered to critical dimensions.

Damage to the needle and the seat in

carburetor body will result if the needle

is forced.

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 (steps 4, 5, and 6).

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 equipment

manufacturer's recommendations. The

recommended low idle speed for basic

engines is 1200 RPM. To ensure best

results when setting the low idle fuel

needle, the low idle speed must not

exceed 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.

Readjust the speed as necessary.

Models with Governed Idle System

An optional governed idle control system is supplied

on some CV18-740 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 20.

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 21. 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

20.

Governed

Idle Spring

Figure 20. Governed Idle Spring Location.

Tab