Kohler Command Pro CV960 Service Manual page 34

Section 5
Fuel System and Governor
Carburetor Adjustments
Adjustment
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 idle fuel adjusting
needle is also set at the factory and normally does not
need adjustment.
require a special ''high altitude'' main
later in this section.
If, however, the engine is hard-starting or does not
operate properly, it may be necessary to adjust or
service the carburetor.
Low Idle Speed (RPM) Adjustment
1.
control in the "idle
low idle speed approximately 300 RPM less than
by turning the low idle speed adjusting screw
in or out. Check the speed using a tachometer.
IMPORTANT: The Governed Idle Speed
Low Idle Speed.
the application. Refer to the equipment
manufacturer's recommendations.
The low idle speed for basic engines is
1200 RPM. To ensure best results when
idle speed should be 1200 RPM (± 75
RPM).
Bowl
Vent
Figure 5-5. Carburetor Adjustment Locations.
5.6
slow
Low Idle Fuel
Adjustments
(With Limiters)
Low Idle
Speed
(RPM)
Adjustment
Screw
Low Idle Fuel Adjustment
caps on the two idle fuel adjusting needles.
Step 3 can only be performed within the
remove the limiter caps.
minutes to warm up. The engine must be warm
3.
a. Turn one of the low idle fuel adjusting
needles out (counterclockwise) from the
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
b. Repeat the procedure on the other
low idle adjustment needle.
Lean
Adjust to
Midpoint
Rich
Left Side
Figure 5-6. Optimum Low Idle Fuel Settings.
Place the
Lean
Adjust to
Midpoint
Rich
Right Side