Carburetor - Mtl; Low Idle Speed (Rpm) Adjustment - Walker MT Detailed Instructions

DANGER
The engine must be running to adjust the
carburetor for engine idle.
against injury, keep hands, feet, face, and
other parts of body away from the muffler/
exhaust pipe, other hot parts of the engine,
and moving or rotating parts of the engine.
3. Start the engine and allow it to warm up by running
at 1/2 throttle for approximately five (5) minutes.
The engine must be warm before making final set-
tings.
4. Move the throttle to the idle position. Adjust idle
speed for 1200 rpm (± 75 rpm) by adjusting the idle
speed screw. Check the idle speed using a ta-
chometer.
5. With the engine idling, adjust the idle mixture by
turning the idle mixture needle valve in (slowly)
from the preliminary setting until engine speed de-
creases and then back out approximately 3/4 to 1
turn to obtain the best low speed performance.
6. Recheck idle speed after the final idle mixture ad-
justment.

Carburetor - MTL

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.
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.
SERVICE INSTRUCTIONS
July 2006
To guard

Low Idle Speed (RPM) Adjustment

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WALKER MANUFACTURING COMPANY
Page: 4-61
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.
Place the throttle control into the "idle" or "slow" po-
sition. Set the low idle speed to 1200 RPM
(± 75 RPM) by turning the low idle speed adjusting
screw (cable w/knob). Check the idle speed using
a tachometer.
If proper operation is not restored after adjusting
the low idle speed, carburetor servicing by an
authorized Kohler engine service dealer may be
required.
Idle Screw
Model MTL Idle Screw