Kohler Command CH620 Service Manual page 30

Fuel System
12. Insert new bushing through new choke lever from
outside and start bushing in outer shaft bore.
Position choke lever so protruding boss on
carburetor housing is between 2 stops formed in
choke lever.
13. Turn old bushing upside down and use it as a driver
to carefully press or tap new bushing into carburetor
body until it bottoms. Check that choke lever pivots
freely without restriction or binding.
14. Install new return spring onto new choke shaft, so
outboard leg of spring is behind formed stop on end
of choke shaft for two-barrel carburetor or between
two formed stops on end of choke shaft on one-
barrel carburetor.
Make sure it stays in this location during following
step.
15. Slide choke shaft and spring into carburetor. Pivot
(preload) shaft 3/4 turn counterclockwise with inner
leg of spring against formed stop within choke lever
as originally assembled. Outer leg of spring must still
be in same position as step 14.
16. Place a drop of Loctite
new screw. Position and install new choke plate to
fl at side of choke shaft. Start screws. Larger cutout
must be on right. Close choke and check plate
alignment within carburetor throat, then tighten
screws securely. Do not overtighten.
17. Check for proper operation and free movement of
parts. Install new cap.
18. Clean carburetor body, main jets, vent ports, seats,
etc., using a good commercially available carburetor
solvent. Keep away from plastic or rubber parts if
non-compatible. Use clean, dry compressed air to
blow out internal channels and ports. Do not use
metal tools or wire to clean orifi ces and jets. Inspect
and thoroughly check carburetor for cracks, wear, or
damage. Inspect fuel inlet seat for wear or damage.
Check spring loaded choke plate to make sure it
moves freely on shaft.
19. Install main nozzle(s) into tower(s) of carburetor
body. End of main nozzle(s) with 2 raised shoulders
(if equipped) should be out/down (adjacent to main
jet(s)). Make sure nozzle(s) are completely
bottomed. Carefully install main jet(s) into tower(s) of
carburetor body on appropriate side, as identifi ed
when removal was performed.
20. For two-barrel carburetor, make sure O-ring near
bottom of each slow jet is new, or in good condition.
Align and insert slow jets into top of carburetor.
For one-barrel carburetor, install slow jet and new
plug into end of slow jet tube.
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222MS™ on threads of each
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21. Install large fl at retaining washer (if equipped) and
secure with mounting screw, attaching ground lead if
originally secured by screw.
22. Install new idle speed (RPM) adjustment screw and
spring onto carburetor. Thread in until 3 or 4 threads
are exposed, as an initial adjustment.
23. Attach inlet needle to plastic tang of fl oat with wire
clip. Formed 90° lip should point up, with needle
valve hanging down.
24. Install fl oat and inlet needle down into seat and
carburetor body. Install new pivot pin through fl oat
hinge and secure with new retaining screw.
25. Hold carburetor body so fl oat assembly hangs
vertically and rests lightly against fuel inlet needle.
Inlet needle should be fully seated but center pin of
needle (on retainer clip end) should not be
depressed. Check fl oat height adjustment.
Be sure to measure from casting surface, not rubber
gasket, if still attached.
26. For two-barrel carburetor, correct fl oat height setting
is 17 mm (0.669 in.) ± 1.5 mm (0.059 in.), measured
from fl oat bottom to body of carburetor. Replace fl oat
if height is diff erent than specifi ed. DO NOT attempt
to adjust by bending fl oat tab.
Two-Barrel Carburetor Float Detail
A Float
When proper fl oat height is obtained, carefully
reinstall fuel bowl onto carburetor, using new
O-rings. Secure with original screws. Torque screws
to 2.5 N·m (23 in. lb.) ± 0.3 N·m (3 in. lb.).
A
1 2
B
Measure From
B
Casting Surface
24 690 06 Rev. O