Kohler Courage SV590 Manuale d'uso - Pagina 12

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Fuel Filter

Some engines are equipped with an in-line fuel filter.

Periodically inspect the filter and replace when dirty.

Replacement is recommended

annually or every 100

hours. Use a genuine Kohler filter.

Carburetor

Troubleshooting

and

Adjustments

NOTE:

Carburetor adjustments should be made only

after the engine has warmed up.

These engines are equipped with a Walbro fixed main

jet carburetor. See Figure 13. Walbro carburetors have

a low idle speed adjustment screw, and either a fixed

or low idle fuel adjusting needle with a limiter cap.

Low Idle Fuel

Adjusting Needle

with Limiter

Low Idle Speed

Adjusting Screw

Figure 13. Carburetor.

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 low idle fuel adjusting needle

is also set at the factory and normally does not need

adjustment.

NOTE:

To ensure correct engine operation at

altitudes above 1525 meters (5000 ft.), it may

be necessary to have an authorized Kohler

dealer install a special high-altitude jet kit in

the carburetor. If a high-altitude kit has been

installed, the engine must be reconverted to

the original jet size, before it is operated at

lower altitudes, or overheating and engine

damage can result.

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 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 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.

Carburetor

Adjustment

NOTE:

These engines may have a fixed idle or limiter

cap on the idle fuel adjusting needle. Step 2

can only be performed within the limits

allowed by the cap.

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 and 3.

2. Low Idle Fuel Needle Setting:

Place the throttle

into the "idle"

or "slow"

position.

Turn the low idle fuel adjusting needle out

(counterclockwise)

from the preliminary setting

until 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 14.