Page: 4-60
WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Fuel Valve Solenoid Linkage Adjustment
(shown with air intake hose removed for clarity)
2. If the gap is incorrect, adjust the linkage by loos-
ening the jam nut at the solenoid, removing the
cotter pin and washer from the connection to the
fuel valve control arm, and screwing the linkage
rod in or out of the solenoid ball joint as required.
3. After adjusting the linkage for the proper gap,
turn the ignition key ON, and check the gap by op-
erating the solenoid.
Carburetor - Model MC, MT
The fixed main jet carburetor is designed to deliver the
correct fuel-to-air mixture to the engine under all oper-
ating conditions. The high idle is set at the factory and
cannot be adjusted. The low idle mixture screw is also
set at the factory and normally does not need adjust-
ment. The only adjustment normally made to the car-
buretor is to set the idle speed. However, if the engine
exhibits any of the following symptoms, it may be nec-
essary to adjust or service the carburetor: black, sooty
exhaust smoke; lack of power; engine miss or backfire;
hard to start; rough running; stalls at low idle speed.
NOTE: Due to the technical requirements of modern
carburetors, refer to the Kohler Service Manual or con-
tact an authorized Kohler engine dealer for carburetor
adjustments and service not described in this section.
Since the carburetor main jet is non-adjustable, for op-
eration above 5000 ft (1,524 m) above sea level, it may
be necessary to change the carburetor main jet for best
fuel economy and power. Contact an authorized Kohler
dealer to change the carburetor main jet.
Engine Idle Adjustment
IMPORTANT: Some emission certified engines may
not have an adjustable idle mixture needle valve; it is
fixed from the factory and the adjustable screw is
"capped". In this case, only the idle speed is adjust-
able and only Step 4 of the instructions below applies.
1. Gently close the idle mixture needle valve by turn-
ing it clockwise until it bottoms lightly.
IMPORTANT: The needle valve and carburetor
seat may be damaged by turning the adjustment
screw too tight.
2. Preliminary Setting: Turn the idle mixture needle
valve out (counterclockwise) 1-1/2 turns from the
closed position. This initial adjustment will allow
the engine to be started and warmed up prior to the
final adjustment.
Carburetor Adjustment
CAUTION
DO NOT change the engine governor set-
tings or overspeed the engine. The gov-
ernor has been factory set for maximum
safe engine operating speed.
1/16 in. (1.6 mm) Gap
Control Valve
Stop
Solenoid Linkage
Rod and Jam Nut
Fuel Valve Control Arm
in Open (Run) Position
CAUTION
ALWAYS use the proper engine service
manual when working on the engine. Un-
authorized maintenance operations or
modifications to the engine MAY result in
unsafe operating conditions.
Low Idle Mixture
Needle Valve
(May be Non-Adjustable)
Fixed Main Jet Under
Shutdown Solenoid
Idle Speed
Screw
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