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If, afterchecking t heitems listedabove, theengine is

hardtostart, r unsroughly, o r stallsatlowidlespeed, it

maybenecessary to adjust o r service thecarburetor.

Adjust Carburetor

NOTE:

Some engines may have a fixed (capped)

idle fuel adjusting

screw or limiter cap. On

these engines, do not attempt steps 1 and 2

below. Proceed

directly to Step 3. On limiter

equipped

models,

adjustment

can only be

performed

within the limits allowed by the

cap.

Figure 16. Carburetor

Details.

Figure 17. Carburetor

Adjustment

Access

Locations (Latch Removed

For Clarity).

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 tile 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

tile filter if necessary.

Make sure fuel is reaching

tile 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.

Idle Fuel Adjustment:

with the engine stopped,

turn tile low idle fuel adjusting

screw in

(clockwise) until it bottoms

lightly. See Figures 16

and 17.

NOTE:

The tip of the low idle fuel adjusting

screw is

tapered

to critical dimensions.

Damage

to the

needle tip and the seat in carburetor

body will

result if the needle is forced.

2. Preliminary

Settings:

Turn the adjusting

screw

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

(step 4).

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.

*NOTE: The actual low idle speed depends

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

(+ 75 RPM).

5. if proper

operation

is not restored

after adjusting,

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 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 tile lower adjustment

tab of the main bracket.

See Figure 18.