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• If the fuel tank is equipped with a shut-off valve,

make sure it is open.

• If the engine is equipped with an in-line fuel filter,

make sure it is clean and unobstructed. Replace

the filter if necessary.

• 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 CH18-740

There are no accessible mixture adjustment screws on

the carburetor. The only setting which can be changed

is the low idle speed.

1. 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 2 and 3).

2. 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

manufacturers recommendations. The

standard low idle speed is 1200 RPM.

3. If proper operation is not restored after adjusting

the low idle speed, carburetor servicing by an

authorized Kohler Engine Service Dealer may be

required.

Models with Governed Idle System

An optional governed idle control system is supplied

on some CH18-740 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 18.

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 19. 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 18.

Governed Idle

Spring

Figure 18. Governed Idle Spring Location.

Hold Throttle Lever

Against Screw

Figure 19. Holding Throttle Lever Against Idle Stop

Screw.

Tab