KOHLER #A
-
271329 (MODEL XG) GAS CARBURETOR
The Model XG carburetor is also of the venturi
-
nozzle type straight gas carburetor suitable for
Natural and
LP
gas.
The XG features an
"
Economizer
"
unit which automatically provides a rich
power mixture when the engine is under heavy load and a leaner economy mixture for part load and
part throttle operation.
A
diaphragm in the economizer is actuated by manifold vacuum which is
applied to the unit through the combined idle
-
economizer line.
The idle line, which extends to the
secondary regulator, provides sufficient gas for operation at low idle speeds when the velocity of air
through the
venturi
is
too low to draw enough fuel to sustain operation. When the economizer feature
is
used, the idle line is usually extended by means of a Tee to connect on the intake manifold side of
the throttle plate (lower flange on carburetor).
With this arrangement, the idle adjustment is made on
the regulator.
The XG carburetor also features a separate starting system which blocks off the main system to
provide a rich mixture for starting.
The starting mixture system operates only when the choke is
fully closed.
The choke is in either full open or full closed position with no intermediate positions.
When the choke is closed, the small volume of air needed is drawn thru a small hole in the choke plate.
Operation: The XG carburetor functions much the same as the previously described model KG1 car
-
buretor.
Refer to operation section on that carburetor for explanation of operating principles.
Adjustments: Refer to Figure 12
-
5 for initial settings on carburetor. After initial adjustment is
made, start engine and make final adjustments as follows:
1.
After engine starts, hold choke in closed position while making final starting mixture
adjustment. Move starting adjustment to obtain maximum speed then continue adjusting
richer until speed drops slightly
--
retighten locknut at this setting then return choke to full
open position.
2.
Allow engine to warm up then move throttle control to idle position. Adjust idle speed
stop if needed to attain proper idle speed (check with hand tachometer) then move idle
adjustment screw (on regulator) until smoothest idle is attained.
3. Open throttle and place engine under normal load. Turn load adjustment in until speed
drops (lean setting) then turn adjustment hack out until speed again increases then drops
from an
overrich setting
--
move adjustment halfway between lean and rich settings for best
mixture under normal load conditions.
Reconditioning:
No regular service is required on the XG carburetor.
If
reconditioning becomes
necessary, completely disassemble carburetor and replace all gaskets, dust seals and worn or dam
-
aged parts.
The diaphragm in the economizer should also be replaced during reconditioning.
Thor
-
oughly wash all parts in solvent and blow out all passages with compressed air. After reassembling
and reinstalling carburetor, check all connections and gasket joints for evidence of leakage.
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