S&S Cycle MGL Carburetor - Manual (Page 3)

4. The fuel line supplied should be used in place of the
stock line. For Harley-Davidson ® Sportster ® models
with the straight feed type petcock, the line is bent
sharply over the throttle cable housing boss toward
the air cleaner backplate between the carburetor
body and the throttle cable. It should then bend
around, forward, to the bowl inlet fitting. A tie
strap is provided to hold the line tight to the
carburetor body. It must be fastened directly behind
the air cleaner backplate around the carburetor
body and fuel line. Secure both ends of the fuel line
with the clamps provided.
The fuel line must not interfere with the operation of
the throttle in any way. See Picture 1 for proper
installation.
For Sportster ® models equipped with the 90-degree
bend, feed type petcock, the line is angled slightly
forward toward the air cleaner backplate, bending
down between the bowl and the throttle cable to
the bowl inlet fitting. Secure both ends of the fuel
line with the clamps provided. See Picture 2 for
proper installation.
The fuel line on big twins can normally be routed
between the cylinders.
Check for leaks before starting the engine.
Some bikes are equipped with exhaust systems that
curve around the gear cover directly under the
carburetor. The fuel line must not touch the pipe or be
placed in a position where it is exposed to extreme
heat.
5. With the fuel line in place, the air cleaner backplate
and mounting bracket can be installed. The
Sportster
® models bracket bolts to the front intake
cam cage stud and the shovelhead bracket bolts to
the front rocker box cover. A short spacer is
provided with the air cleaner bracket mounting
hardware that must be installed between the
bracket and backplate. Immerse the foam portion
of the air cleaner element in a light weight engine
oil and squeeze out. Before final assembly of the air
cleaner, check the needle and seat for possible
leakage. Lean the motorcycle over slightly to the
right and turn the fuel petcock on. If gas does not
leak out of the end of the carburetor after 10
seconds, the element and air cleaner cover can be
installed. If the needle and seat do not hold, the
bowl should be removed and checked.
6. Special instructions for engines equipped with
breather vent line to the air cleaner:
S&S ® air cleaners have a special boss cast into the air
cleaner backplate designed especially for this vent.
The backplate should be drilled and tapped for a
1 /
8
”
pipe nipple. This can be purchased at most any
hardware store. After the air cleaner backplate
modification is done, the vent line should be
secured with a clamp.
A. Starting Procedure
1. This carburetor has a conventional choke type
starting mechanism. It has a tension spring, Part
No. 144 that constantly applies pressure against
the choke lever, Part No. 146 so that it will
remain in position once set. The choke plate,
Part No. 73, is fully closed when the lever is
pulled up to the stop.
WARNING
WARNING
Picture 1
Picture 2
3