Fuel
System
,
CARBURETOR
Most carburetors have a fixed main jet. An optional main
fuel adjustment kit (altitude compensation kit) is
available.
The carburetor idle mixture was set for maximum
efficiency at the factory and should normally not be
disturbed.
If
adjustments seem necessary, first be sure
the ignition system is working properly and governor
sensitivity is properly adjusted.
If
adjustment is needed, refer to Figures 1 and
2
and
proceed as follows:
I]
Overfightening the mixfure adjustment
screw
will
cause carburetor damage.
Turn
mixture adjustment screw
in
on/y
until
light
tension can be felt.
1.
Walbro carburetor mixture screw settings:
Turn both mixture screws in until lightly seated, then
back the idle mixture screw out 1-1
/8
turns and the
main mixture screw out 1-1
/2
turns.
Nikki
full
adjustment carburetor mixture screw
settings:
Turn idle mixture screw in until lightly seated, then
back idle mixture screw out 1-1
/4
turn. On engines
equipped with optional main fuel adjustment, turn
main mixture screw in until lightly seated then back
the main mixture screw
out
as specified below.
B43E
718
to
1-1
/8
turns
B43G
1-1
14
to 1-1
/2
turns
B48G
1
-5/8
to 1-718 turns
Nikki limited idle adjustment carburetor mixture
screw settings:
The carburetor has
a
limited idle adjustment range
between stops of *1/8 turn. The screw should only
be adjusted within these limits; in to lean the
mixture, out to richen. There is no main mixture
adjustment.
When replacing the idle mixture screw, turn until
lightly seated, then turn back idle mixture screw out
1-1
/4
turn. Replace the limiter cap with the plastic
stop approximately centered.
LOW
SPEED
__--
SIDE PULL GOVERNOR ASSEMBLY
FRONT PULL GOVERNOR ASSEMBLY
FIGURE
1.
GOVERNOR SPEED ADJUSTMENT
7-1
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