Kohler HD Series Service Manual page 25

Carburetor Servicing
Accidental Starts can cause severe injury or
death.
Disconnect and ground spark plug lead(s)
before servicing.
Before working on engine or equipment, disable
engine as follows: 1) Disconnect spark plug lead(s). 2)
Disconnect negative (–) battery cable from battery.
NOTE: Main and slow jets are fixed and size specific
and can be removed if required. Fixed jets for
high altitudes are available.
● Inspect carburetor body for cracks, holes, and other
wear or damage.
● Inspect float for cracks, holes, and missing or
damaged float tabs. Check float hinge and shaft for
wear or damage.
● Inspect fuel inlet needle and seat for wear or damage.
1. Perform removal procedures for appropriate air
cleaner and carburetor outlined in Disassembly.
2. Clean exterior surfaces of dirt or foreign material
before disassembling carburetor. Remove bowl
retaining screws, and carefully separate fuel bowl
from carburetor. Do not damage fuel bowl O-rings.
Transfer any remaining fuel into an approved
container. Save all parts. Fuel can also be drained
prior to bowl removal by loosening/removing bowl
drain screw.
3. Remove float pin and inlet needle. Seat for inlet
needle is not serviceable and should not be
removed.
4. Clean carburetor bowl and inlet seat areas as
required.
5. Carefully remove main jet from carburetor. After
main jet is removed, main nozzles can be removed
through bottom of main towers. Note orientation/
direction of nozzles. End with 2 raised shoulders
should be out/down adjacent to main jets.
6. Save parts for cleaning and reuse unless a jet kit is
also being installed. Clean slow jets using
compressed air or carburetor cleaner, do not use
wire.
NOTE: There are 2 O-rings on body of idle jet.
Carburetor is now disassembled for appropriate cleaning
and installation of parts in overhaul kit. See instructions
provided with repair kits for more detailed information.
14 690 10 Rev. --
WARNING
KohlerEngines.com
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.
Auto Choke Troubleshooting (if equipped)
If engine is equipped with auto choke, identify design
and follow appropriate troubleshooting procedure.
NOTE: Procedures may be easier to perform with
engine cover removed. Refer to Disassembly/
Inspection and Service and Reassembly
procedure.
Auto Choke Components - Vacuum/Diaphragm
Design
A
Bimetallic Spring
A
Housing
C Diaphragm Assembly
E Vacuum Hose
A bimetallic spring reacts to muffl er heat and moves
linkage that opens or closes choke. A diaphragm that
operates from intake manifold vacuum assists spring
system. These two elements work together to operate
a smooth choke system that facilitates easy reliable
starting.
Use following procedures to troubleshoot vacuum/
diaphragm design auto choke system and its
components. These procedures are to be performed on
a cold engine.
Fuel System
B
D
E
B Linkage
D Choke Plate
C
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