Engine Service Manual

Fuel System
3932 690 03 Rev. I KohlerEngines.com
Dual Position Thermostat Installation
NOTE: Thermostat temperature must be at room temperature before testing.
1. Determine operating position of thermostat. Thermostat position is determined by ignition system: Capacitive
Discharge Ignition (CDI) or Magnetic Discharge Ignition (MDI).
For CDI systems secure thermostat in position (C).
For MDI systems secure thermostat in position (D).
2. Install Smart-Choke
™
bracket assembly with thermostat in proper position. Do not plug thermostat wire at this
time.
3. Engine must be started at idle with thermostat wire disconnected to test system function.
4. If engine runs correctly, no further adjustment is needed.
5. If engine speed does not increase to idle speed on start up, ensure spring tab (E) is engaged in lever slot (F) and
thermostat is in proper position for ignition system of engine.
6. Retest system function.
7. Plug in thermostat wire.
Dual Position Thermostat
D
C
D
C
E
B
A
A
CDI Ignition Module
(Top View)
B
MDI Ignition Module
(Top View)
C CDI Position D MDI Position
E
Spring Tab Must be
Located in Lever Slot
F Lever Slot
F