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Maintenance Instructions ADJUSTMENTS
77
Tilt-Up Deck Adjustable Stop
When the carrier frame hinge joint is properly adjust-
ed, the deck lock levers should move in and out of the
engaged and disengaged positions freely. All four
hitch pins used for height adjustment should sit flush
on the washers above the deck pin bushing. On a
level surface, if any pin is sticking up (likely the front
pins), tighten the opposite side or loosen the same
side to lower the pin. Adjustments are made by loos-
ening the jam nut and tightening or loosening the set
screws on the Deck Mount Pivot Brackets. Retighten
the jam nut when the adjustment is complete.
Tilt-Up Deck Adjustable Stop
Carburetor
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.
Since the carburetor main jet is non-adjustable, for
operation 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 au-
thorized 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 adjustable and only Step 4 of the instructions be-
low applies.
1. Gently close the idle mixture needle valve by
turning it clockwise until it bottoms lightly.
IMPORTANT: The needle valve and carburetor
seat may be damaged by turning the adjust-
ment screw too tight.
2. Preliminary Setting: Turn the idle mixture nee-
dle valve out (counterclockwise) 1-1/2 turns
from the closed position. This initial adjust-
ment will allow the engine to be started and
warmed up prior to the final 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.
Set Screw
Jam Nut
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.