Kohler K241 Manuale d'uso - Pagina 12

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Walbro Carburetor Adjustment

In general, turning the adjusting

needles in (clockwise)

decreases the supply of fuel to the carburetor. This

gives a leaner fuel-to-air

mixture. Turning the

adjusting needles out (counterclockwise)

increases

the supply of fuel to the carburetor.

Idle Speed Screw

Figure 9.

NOTE:

The tip of the low idle fuel and main fuel

adjusting

needles are tapered to critical

dimensions.

Damage to the needles and the

seats in carburetor

body will result if the

needles are forced.

1. With the engine stopped, turn the adjusting

needle(s) in (clockwise)

until it bottoms light/y.

2. Preliminary

Settings: Turn the adjusting

needle(s) out (counterclockwise)

from lightly

bottomed as follows or to the rich side of

adjustment.

K241

K301

K321

K341

Walbro Fixed Jet

Low Idle

l-l I4 turns

1-l /4 turns

l-l I2 turns

1 turn

Walbro Adjustable

Jet

Low Idle

Main Idle

K241

K301

K321

K341

I-314 turns

I-l

turns

2-112 turns

l-l 18 turns

l-l I8 turns

l-l I4 turns

l-l 14 turns

3. Start the engine and run at half throttle for five to

ten minutes to warm up. The engine must be

warm before making final settings.

4. Main Fuel Needle Setting:

This adjusfment is

required only for adjustable

main jet carburetors.

If the carburetor is a fixed main jet type, disregard

this setting.

Place the throttle into the "fast" position.

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. Back the needle out approximately

l/4 turn. See Figure 10 for best main fuel

performance.

Back out

Appx.

118

to II4

Lean

turn.

Lean

Figure 10. Optimum

Main Fuel Setting.

5. 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 the equipment

manufacturer's

instructions

for specific

low idle speed settings. To ensure best

results when setting the low idle fuel

needle, the low idle speed must not

exceed 1500 RPM.