Kohler KS540 [31/92] Fuel system
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Kohler KS540 [31/92] Fuel system

Kohler KS590 [31/92] Fuel system
31
Fuel System
22 690 01 Rev. -- KohlerEngines.com
8. Inspect and note choke valve position, placement,
and mating of valve plate to choke bore for proper
reassembly. While holding choke shaft in full open
position, pull choke valve straight out of bore and
choke shaft using a pliers. Lift choke shaft and
spring out of carburetor body. Inspect choke shaft
bores for wear or dirt. If wear is noted within choke
shaft bore of carburetor body, a complete carburetor
replacement is recommended.
9. Install new choke shaft and spring into carburetor
choke shaft bore in same position as noted in
previous step. Position spring tab in proper position.
While holding choke in full open position, carefully
slide new choke valve through center slot of choke
shaft, paying attention to proper orientation of valve.
Push valve plate into shaft until plate parks in detent.
Rotate choke shaft assembly from full open to full
closed position. No interference should be noted.
10. Inspect and note throttle valve and lever position.
Turn idle speed screw out (counterclockwise) two full
turns to allow throttle valve to seat in a fully closed
position with throttle bore. While holding throttle in
closed position, remove two screws from throttle
shaft/valve plate. Remove throttle plate from throttle
shaft. Lift throttle shaft and shaft fi lter out of
carburetor body. Inspect throttle shaft bores for wear
or dirt. If wear is noted within throttle shaft bore of
carburetor body, a complete carburetor replacement
is recommended.
11. Install new shaft fi lter over throttle shaft and position
at top of shaft against lever. Install new throttle shaft
into carburetor throttle shaft bore in same position as
noted in previous step. Ensure that throttle lever will
contact idle speed screw when moved to closed
position. Inspect edge of new throttle plate. Note that
edge is chamfered to seal against throttle bore of
carburetor when closed. Installing throttle plate
incorrectly may allow throttle to pinch tight. Place a
drop of Loctite® on threads of each new screw.
While holding slight pressure on throttle lever to
closed position, align and start two plate screws.
Rotate throttle shaft assembly from completely
closed to full open position. Ensure there is no
binding or restriction, then tighten screws securely.
Do not overtighten.
12. Install new O-ring on main jet. Put a light fi lm of oil
on O-ring. Place jet with O-ring into center stem of
carb spacer. Use a blunt tool to gently push and seat
jet/O-ring.
13. Install new small O-ring over inlet seat boss of carb
spacer. Position new O-ring into molded grooves of
carb spacer.
14. Holding both carburetor pieces in upright position,
gently push to seat carb spacer into carburetor body.
15. Place inlet needle on fl oat and lower into position on
carb spacer; install fl oat pin to secure.
16. Reinstall carburetor bowl and secure to body with
two screws. Torque screws to 4.0 N·m (35 in. lb.).
17. Install new gasket on solenoid assembly. Install
solenoid assembly in fuel bowl and tighten securely.
18. Reinstall carburetor using appropriate new
carburetor gaskets.
High Altitude Operation
If this engine is operated at an altitude of 4000 ft.
(1219 meters) or above, a high altitude carburetor
kit is required. To obtain high altitude carburetor kit
information or to fi nd a Kohler authorized dealer, visit
KohlerEngines.com or call 1-800-544-2444 (U.S. and
Canada).
This engine should be operated in its original
confi guration below 4000 ft. (1219 meters).
Operating this engine with the wrong engine
confi guration at a given altitude may increase its
emissions, decrease fuel effi ciency and performance,
and result in damage to the engine.

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