S&S Cycle TWO THROAT Carburetor (Serial E1190 & Higher) - Manual (Page 8)

D. General Information
1. Do not chrome the carburetor as extensive
damage will result.
2. The carburetor has several drilled passages that
are permanently sealed with plugs. Do not attempt
to remove these plugs.
3. Do not over-tighten the idle mixture screw,
intermediate jets, or intermediate air bleeds.
4. The throttle plates. Part #11-2255, and throttle
shaft, Part #11-2254, should be checked annually
for signs of wear. Replace, if necessary. If they are
removed, be sure that the throttle plates are
reinstalled correctly.
See Figure A.
5. If the throttle arm, Part #11-2248, is removed from
the throttle shaft, it must be reinstalled in the wide
open position with the butterfly at 90° to the fully
closed position.
See Figure B.
6. The correct float level adjustment is shown below in
Figure C. When the motorcycle is not running, the
fuel shutoff valve should always be turned of. In the
event fuel runs out of the bowl overflow hose,
remove the bowl assembly and inspect the float and
needle and seat assembly to be sure it doesn’t bind
and the float level is properly set.
See Figure C.
7. If an air cleaner other than ours must be used,
make sure the bowl vent hole in the inlet end of the
carburetor is not covered and sealed off.
8. Cams and exhaust systems make some engines
difficult to carburate. A combination of cam overlap
and back pressure, or lack of back pressure will
cause mixture dilution at certain engine RPMs.
This dilution will cause engine roughness or
misfiring when the engine is held in this range. To
attempt to carburate for this condition usually
destroys the carburetion over the rest of the range.
It is best under these conditions to change the cam
and/or the exhaust system.
9. S&S ® has found that stock head pipes equipped
with a good quality slip-on muffler will provide a
nice amount of horsepower and torque.
10. Use a fuel filter to keep dirt out of this carburetor.
With the small metering holes used in the
intermediate system and the accelerator pump
nozzles, it is wise to insure against contamination
to provide trouble free operation.
8
Figure A
Top
Side View
Bevels must
be at angles
shown when
installing
throttle plate.
Figure C
Side View
Bowl is shown upside down.
Figure B
Side View
Throttle plate
horizontal
Throttle arm
set screw
Throttle arm
against stop