Kohler KS540

32
Fuel System
KohlerEngines.com 22 690 01 Rev. --
Smart-Choke
™
Diaphragm assembly consists of a spring controlled diaphragm for initial choke pull-off and a thermostat to completely
open choke while engine warms up. A vacuum signal from intake manifold is routed through a check valve to
diaphragm and partially opens choke once engine starts. To complete choke opening, a bimetallic spring in diaphragm
assembly heats up over a preset time once this thermostat sees 12V as activated by oil pressure switch. When
engine is cold, a spring on diaphragm, in conjunction with a bimetallic spring, will hold choke closed for starting. When
engine is warm, bimetallic spring holds choke completely open while engine is running. Choke will be 2/3 closed when
warm and not running, allowing for partial choke on a hot restart. These two elements work together to operate a
smooth choke system that facilitates easy reliable starting in all conditions.
Smart-Choke
™
Components
E
K
C
A
B
L
B
C
G
D
F
K
H
I
J
A
Check Valve
Assembly
B Vacuum Hose C K40 x 1.79 Screw D Diaphragm Assembly
E Choke Linkage F Intake Manifold G
Intake Manifold
Gasket
H
Carburetor Gasket
(Throttle)
I Carburetor Assembly J Carburetor Gasket K Carburetor Nut L Intake Adapter