Kohler K91 Kullanım ve Bakım Kılavuzu - Sayfa 10

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CARBU.RETOR TRdUBLESHOOTlNG AND ADJUSTMENTS

Carburetor adjustments should be made on/y after engine has warmed up.

Kohler K91, K161 and

K181

engines are equipped

with one of two basic types

carburetors

Kohler or

Walbro - fixed main jet or adjustable main jet.

The carburetor is designed to deliver the correct fuel-

to-air mixture to the engine under all operating

conditions.

The main fuel and idle fuel needles on

adjustable jet carburetors are set at the factory and

normally do not require further adjustment. On fixed

jet carburetors, the low idle fuel needle is also set at

the factory and normally does not need further

adjustment.

The main fuel jet is calibrated and

installed at the factory and is not adjustable*.

*NOTE: Engines operating at attitudes above

approximately 1830 m (6000 ft) may require

a special "high altitude" main jet.

TROUBLESHOOTING

If engine troubles are experienced that appear to be

caused by the carburetor, 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.

Make sure fuel is reaching the carburetor. This

includes checking the fuel shut-off valve, fuel tank

filter

screen, in-line fuel filter, fuel lines, and fuel

pump for restrictions or faulty components as

necessary.

Make sure the air cleaner base and carburetor is

securely fastened to the engine using gaskets in

good condition.

Make sure the air cleaner element is clean and all

air cleaner components are fastened securely.

after checking the items listed above, starting or

engine operation problems exist, it may be

necessary to adjust or service the carburetor.

NOTE: Carburetor adjustments should be made

only after the engine has warmed up.

Kohler Carburetor Adjustment

1 .

With the engine stopped, turn the fuel adjusting

needles In (clockwise) until they bottom lightly.

NOTE: The tips of the fuel adjusting needles are

tapered to critical dimensions.

Damage to

the needles and seats in carburetor body will

result if the needles are forced.

Preliminary Settings: Turn the. adjusting

needles out (counterclockwise)

from lightly

bottomed as follows:

1 KOHLER ADJ.

1 LOW IDLE

1 MAIN FUEL

K91

1 l-1/2 TURNS

1 2TURNS

K161

1 l-l/2

TURNS

1 3TURNS

K181

l-1/4 TURNS

2 TURNS

Start the engine and run at half-throttle for 5 to

IO minutes to warm-up. The engine must be

warm before making final settings (steps

4-6).

Main Fuel Needle Setting: This adjustment is

required for adjustable main jet carburetors

only. If the carburetor is a fixed main jet type

refer to Walbro adjustment.

Place the throttle into the Vast" position. If

possible, place the engine under load.

Turn the main fuel adjusting needle 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.