Filter
Top Products
Maintenance Instructions ADJUSTMENTS
90
Carburetor Adjustment
3. Start the engine and allow it to warm up by run-
ning at 1/2 throttle for approximately five (5)
minutes. The engine must be warm before
making final settings.
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
tachometer.
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
decreases and then back out approximately 3/4
to 1 turn to obtain the best low speed perfor-
mance.
6. Recheck idle speed after the final idle mixture
adjustment.
Carburetor - MTL
The fixed main jet carburetor is designed to deliver
the correct fuel-to-air mixture to the engine under all
operating conditions. The high idle is set at the fac-
tory and cannot be adjusted. The low idle mixture
screw is also set at the factory and normally does
not need adjustment. The only adjustment normally
made to the carburetor is to set the idle speed.
However, if the engine exhibits any of the following
symptoms, it may be necessary 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 mod-
ern carburetors, refer to the Kohler Service Manual
or contact an authorized Kohler engine dealer for
carburetor adjustments and service not described in
this section.
Low Idle Speed (RPM) Adjustment
1. Place the throttle control into the "idle" or "slow"
position. Set the low idle speed to 1200 RPM
(± 75 RPM) by turning the low idle speed adjust-
ing screw (cable w/knob). Check the idle speed
using a tachometer.
2. If proper operation is not restored after adjust-
ing the low idle speed, carburetor servicing by
an authorized Kohler engine service dealer may
be required.
Model MTL Idle Screw
DANGER
The engine must be running to adjust the
carburetor for engine idle. To guard
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.
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.
Fixed Main Jet Under
Shutdown Solenoid
Idle Speed
Screw
Low Idle Mixture
Needle Valve
(May be Non-Adjustable)
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.
Idle Screw