Kohler COMMAND CV-675-740 Owner's Manual - Page 15

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Fuel Line

EFI Engines:

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A special fuel line, capable of

withstanding the high pressure of the EFI fuel system,

is used (must meet SAE R9 specifications). See Figure

17. If fuel line must be replaced, see your Kohler

Engine Service Dealer.

Carburetor Troubleshooting and

Adjustments

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 high idle mixture is set at the factory

and cannot be adjusted. The low idle fuel adjusting

needle (if equipped) is also set at the factory and

normally does not need adjustment.

Figure 18. Carburetor CV17-25, CV675-740.

Troubleshooting

If engine troubles are experienced that appear to be

fuel system related, check the following areas before

adjusting the carburetor.

Make sure the fuel tank is filled with clean, fresh

gasoline.

Make sure the fuel tank cap vent is not blocked

and that it is operating properly.

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

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* (+

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 (+

RPM).

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

make sure it is open.