Kohler HD Series Service Manual page 26

Fuel System
Cover, Element, and Breather Cover
D
B
A Air Cleaner Cover
C Breather Cover
1. Remove air cleaner cover, air cleaner, and breather
cover from air cleaner base.
2. Check choke linkage for binding or debris build up.
Gently actuate linkage and observe that choke plate
has full range of movement (open and close).
3. Remove vacuum hose from carburetor vacuum
fi tting. Attach a vacuum gauge or manometer to
carburetor vacuum fi tting. Run engine while holding
choke plate open. Gauge should indicate a vacuum
with a minimum of 15" of water. If reading is correct,
check again for binding of restricted linkage.
4. If vacuum indicated is less than 15" of water,
problem is not an auto choke issue.
Diaphragm Assembly and Hose
B
A Choke Plate
C Vacuum Fitting
26
C
A
B Element
D Air Cleaner Base
D
C
A
B Vacuum Hose
D Diaphragm Assembly
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5. Note position of choke plate. Attach a vacuum pump
to vacuum hose. Choke plate should open 1/2 to 3/4
under vacuum and with a minimum of 15" of water. If
diaphragm assembly is unable to open choke plate,
check hose for cracks, leaks, or restrictions. If
necessary replace vacuum hose. If hose is in
working condition and choke plate fails to open with
specifi ed vacuum, or diaphragm fails to hold choke
plate open for a minimum of 3 seconds, replace
diaphragm assembly.
6. Attach vacuum hose to carburetor vacuum fi tting.
7. Start engine. Upon start up choke plate should be
1/2 to 3/4 open. Choke plate should gradually
change to full open position after 2 to 2-1/2 minutes
of running. This action is performed by bimetallic
spring assembly being heated. If choke plate fails to
open, recheck linkage for binding. If necessary
replace bimetallic spring assembly.
NOTE: Inspect to ensure choke linkage is not binding.
Choke Plate and Bimetallic Spring Housing
B
A Choke Plate
A
Bimetallic Spring
B
Assembly
14 690 10 Rev. --