Kohler 4CKM User Manual

TP-5393 9/933-8 Scheduled Maintenance
Gasoline Carburetor Adjustments
Lack of power and black sooty exhaust smoke usually
indicate that the fuel mixture is too rich. An overrich
mixture may be caused by a clogged air cleaner or
improperly adjusted choke. Always check the air
cleaner before readjusting the choke or carburetor. If
the engine skips (misses) or backfires, the fuel mixture
may be too lean. To locate adjustment needles refer to
Figure 3-10.
1-905
1
2
1. Main Fuel Needle
2. Idle Fuel Needle
Figure 3-10. Carburetor Adjustment Needles
NOTE
Turning the adjusting needles in (clockwise) decreases
the supply of fuel to the carburetor. This gives a leaner
fuel/air mixture. Turning the adjusting needles out
(counterclockwise) increases the supply of fuel to the
carburetor. This gives a richer fuel/air mixture.
Main And Idle Fuel Mixture
1. Stop the engine. Turn the main fuel and idle fuel
adjusting needles in (clockwise) until they bottom
lightly.
NOTE
The ends of the main fuel and idle fuel adjusting
needles are tapered to critical dimensions.
Damage to needles and seats will result if the
needles are forced.
2. Preliminary Settings: Turn the main fuel and idle
fueladjustingneedles out (counterclockwise)from
lightly bottomed as follows:
Main Fuel Needle 2 1/4 Turns
Idle Fuel Needle 1 1/2 Turns
3. Start the engine and run at half-load for 5-10
minutes to warm up. The engine must be warm
before making final settings.
4. FinalSetting—Main Fuel: Placeengine3/4tofull
load. Turn main fuel adjusting needle in
(clockwise) from preliminary setting until the
engine does not operate smoothly. Note the
position of the needle.
Now turn the adjusting needle out
(counterclockwise) 1/4 turn.
NOTE
At higher elevations the main fuel adjustment
needle will require leaning.
1
2
3
4
1. Adjust 1/4 turn richer than lean operating limit.
2. Lean
3. Rich
4. Fuel Adjusting Screw
Figure 3-11. Carburetor Adjustment
5. Final Setting—Idle Fuel: Set idle fuel adjusting
needle using the same procedure as in step 4.

Kohler 4CKM Specifications

General

Brand	Kohler
Model	4CKM
Category	Inverter
Language	English