Kohler command pro CH742 Service Manual page 26

Fuel System
14. Clean carburetor body, main jets, vent ports, seats,
etc., using a good commercially available carburetor
solvent. Keep solvent away from plastic or rubber
parts if non-compatible or damage may occur. 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.
15. Clean carburetor fuel bowl as required, including
accelerator jet, feed hole, and check valve in bottom
of bowl.
16. Install new diaphragm assembly with outer lip resting
in groove of pump base. Install new spring on top of
diaphragm center plate. Reinstall cover and secure
with new screws. Torque screws to 1-1.4 N·m (8-12
in. lb.). Reinstall solenoid using new gasket and
torque solenoid to 3.4-5.6 N·m (30-50 in. lb.).
17. Reinstall main nozzles assemblies and slow jets in
their respective sides.
18. Attach new inlet needle into metal hinge of fl oat.
Groove near top of needle slides into formed fork.
19. Install fl oat and inlet needle down into seat and
carburetor body. With fl oat hinge held in between
body mounting legs, insert new pivot pin through
fl oat hinge and into opposite hole.
20. Invert carburetor body as shown and measure
dimension between top of fl oat and top of gasket
fl oat rib on body. Correct fl oat setting is 1.6 mm
(0.063 in.) ± 0.5 mm (0.02 in.).
21. If fl oat height adjustment is required, a small fl at
blade screwdriver can be used to pry tab up from
side, or pry tab down on end.
22. When proper fl oat height is obtained, carefully
reinstall fuel bowl, using new bowl gasket. Secure
with new screws. Torque screws to 2.3-2.7 N·m
(20-24 in. lb.).
23. Reattach accelerator pump vacuum hose.
24. Use new mounting gaskets for air cleaner and
carburetor. Reinstall carburetor and disassembled
components following Reassembly procedures.
25. Reconnect spark plug leads and negative battery
cable. Start engine and perform Low Idle Speed
Adjustment.
High Altitude Operation
Engines may require a high altitude carburetor kit to
ensure correct engine operation at altitudes above
1219 meters (4000 ft.). To obtain high altitude kit
information or to fi nd a Kohler authorized dealer visit
KohlerEngines.com or call1-800-544-2444 (U.S. and
Canada).
This engine should be operated in its original
confi guration below 1219 meters (4000 ft.) as damage
may occur if high altitude carburetor kit is installed and
operated below 1219 meters (4000 ft.).
26 KohlerEngines.com 24 690 34 Rev. D