Kohler Command CV730 User Manual download pdf (Page 55)

5.21

Section 5

Fuel System and Governor

Adjustment

NOTE: Carburetor adjustments should be made only

after the engine has warmed up.

The carburetor is designed to deliver the correct fuel-

to-air mixture to the engine under all operating

conditions. The main fuel jet is calibrated at the

factory and is not adjustable*. The idle fuel adjusting

needle is also set at the factory and normally does not

need adjustment.

Depending on model and application, engines may

also be equipped with a “Governed Idle System.” If

equipped with a “Governed Idle System”, refer to

“Models with Governed Idle System” when

performing any carburetor adjustment, as an

additional step to the listed adjustment procedure(s) is

required.

*NOTE: Engines operating at altitudes above

approximately 1500 m (5000 ft.) may require

a special ‘‘high altitude’’ main jet. Refer to

‘‘High Altitude Operation’’.

If, however, the engine is hard-starting or does not

operate properly, it may be necessary to adjust or

service the carburetor.

*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).

Low Idle Fuel Adjustment

NOTE: Engines will have fixed low idle or limiter

caps on the two idle fuel adjusting needles.

Step 3 can only be performed within the

limits allowed by the cap. Do not attempt to

remove the limiter caps.

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

minutes to warm up. The engine must be warm

before doing steps 2, 3, and 4.

2. Place the throttle control into the “idle” or

“slow” position. Adjust the low idle speed to

1200 RPM*. Follow the “Adjusting the Low Idle

Speed (RPM)” procedure.

3. Low Idle Fuel Needle(s) Setting: Place the

throttle into the “idle” or “slow” position.

a. Turn one of the low idle fuel adjusting needles

out (counterclockwise) from the preliminary

setting until the engine speed decreases

(rich). Note the position of the needle. Now

turn the adjusting needle in (clockwise). The

engine speed may increase, then it will

decrease as the needle is turned in (lean). Note

the position of the needle. Set the adjusting

needle midway between the rich and lean

settings. See Figure 5-40.

b. Repeat the procedure on the other low idle

adjustment needle.

4. Recheck/adjust the Low Idle Speed (RPM), to the

specified setting.

Figure 5-39. Keihin Two-Barrel Carburetor.

Carburetor Adjustment

Low Idle Speed (RPM) Adjustment

1. Low Idle Speed (RPM) 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.

Low Idle Fuel Adjusters

(with Limiters)

Low Idle Speed (RPM)

Adjustment Screw

Fuel Solenoid

Bowl Drain Screw

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Kohler Command CV730 User Manual Page 55

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