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SECTION 6A
FUEL SYSTEMS AND GOVERNORS
C. Increase engine RPM to the high speed set-
ting of 3600.
Apply a load and adjust the high
speed mixture screw at the adapter (see
Figure 6A-24), as follows:
Tum high speed mixture screw OUT toward
the rich side until engine RPM drops (this
should be confirmed with tachometer). Then
tum screw IN toward lead side until engine
RPM recovers and begins to fall off. At this
point, again tum the screw OUT just until en-
gine reaches top RPM and stop.
It this procedure is used correctly, tne unit will
now be adjusted to LEAN BEST POWER.
d. When using a dual fuel adapter with a gaso-
line carburetor, the gasoline carburetor mixture
setting will need to be adjusted from that of
the factory.
LPG CARBURETOR
Some M18 & M20 Engines are equipped with Kohler-
built Liquid Propane Gas (LPG) carburetors as shown
in Figure 6A-25. On applications using this carbure-
tor, the equipment manufacturer furnishes the regula-
tors, fuel tank and other LPG system components.
Use the part number stamped on the body of the car-
buretor for ordering the correct replacement compo-
nents for the carburetor involved as listed in the
M18 & M20 parts manual.
The Venturi, fuel inlet fitting, adjusting needles, screws
and springs can be replaced on these carburetors
however the throttle shaft/lever assembly is non-
serviceable. If the shaft or bore become wom or dam-
aged, the carburetor will have to be replaced.
If starting or performance problems occur, check the
air cleaner first and service LPG system components
following instructions provided by the equipment man-
ufacturer.
If carburetor readjustment is indicated, stop
the engine and reset the needle adjusting screws to
the initia! settings shown in Figure 6A-25 then restart
the engine, allow it to warm up and make final adjust-
ments on regulators and/or carburetor to achieve best
perfomance.
Idle Speed
Throttle Shaft
210 2-3/4
Turns Open
Idle Fuet
Adj. Screw
1-3/4 to 2
Figure 6A-25. Kohler LPG Carburetor.
6A.19
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