S&S Cycle VFI Induction System - Manual (Page 9)

NOTE: Hardware kit 31-2077 is not required for Evolution ®
installations.
b. Install head breathing banjo fittings in heads.
See Picture 17. Apply red Loctite
® (271) to
threads and tighten the ( 1 /
2
") breathing fittings to
19-21 ft-lbs (228-252 in-lbs).
c. Install breathing hose onto banjo fittings and
throttle body vent tube. Trim the ends of the
vent hose as required. Secure with spring
clamps provided.
See Picture 18.
Pushing the rubber head breathing crossover hose all
the way down onto the throttle body vent tube will cause
the vent tube to block the hose.
d. A small rubber cap should be pre installed by
S&S
® on the front intake manifold spigot. If it
is not present, one will need to be obtained
and placed on the spigot.
e. Remove one of the four (4) 1 /
4
"-20 x 7 /
8
" socket
head cap crews that attach the throttle body to
the manifolds and coat the threads with Loctite
®
242 or equivalent. Replace the screw but do
NOT tighten at this time.
f. Repeat for the remaining three (3) screws. DO
NOT TIGHTEN SCREWS AT THIS TIME.
2. Harley-Davidson ® Twin Cam 88 ® engine
breathing hose and hardware installation.
a. Select hardware from included kit 17-0462 to
match layout as shown in Picture 19.
NOTE: Hardware kit 31-2077 is not required for Twin Cam 88 ®
installations.
b. Install head breathing banjo fittings in heads.
See Picture 17. Apply red Loctite
® (271) to
threads and tighten the ( 3 /
8
") breathing fittings to
14-16 ft-lbs (168-192 in-lbs).
c. Install breathing hose onto banjo fittings and
throttle body vent tube. Trim the ends of the
vent hose as required. Secure with spring
clamps provided .
See Picture 18.
Pushing the rubber head breathing crossover hose all
the way down onto the throttle body vent tube will cause
the vent tube to block the hose.
d. A small rubber cap should be pre installed by
S&S on the front intake manifold spigot. If it is
not present, one will need to be obtained and
placed on the spigot.
e. Remove one of the four (4) 1 /
4
"-20 x 7 ⁄
8
" socket
head cap crews that attach the throttle body to
the manifolds and coat the threads with Loctite
®
242 or equivalent. Replace the screw but do
NOT tighten at this time.
f. Repeat for the remaining three (3) screws. DO
NOT TIGHTEN SCREWS AT THIS TIME.
3. SSW+ Early Style (Crankcase engine breathing)
breathing hose and hardware installation.
a. Select hardware from the included kits 31-2077
and 17-0462 to match layout as shown in
Picture 20.
b. Install cylinder head spacers into both front heads.
apply red Loctite
® (271) to the first three threads
and tighten to 14-16 ft-lbs (168-192 in-lbs).
c. Install small vacuum hose between spigots on
front head and front intake manifold. See
Pictures 20 and 21.
d. Place large rubber cap on throttle body.spigot
e. Install large breather hose and one way valve
onto hose fitting at lower rear of case. See
Picture 20.
Valve in picture 20 is a one-way valve. It must be
installed with the white end facing the engine. The valve
allows air out of the motor, but not back in. Do not leave
the one way valve out of the system! Leaving it out will
cause a vacuum leak at the intake manifold, and poor
engine operation.
f. Remove one of the four (4) 1 /
4
"-20 x 7 /
8
" socket
head cap crews that attach the throttle body to
the manifolds and coat the threads with Loctite
®
242 or equivalent. Replace the screw but do
NOT tighten at this time.
g. Repeat for the remaining three (3) screws. DO
NOT TIGHTEN SCREWS AT THIS TIME.
4. S&S Late Style (Cylinder head engine
breathing) breathing hose and hardware
installation.
a. Select hardware from the included kits 31-2077
and 17-0462 to match layout as shown in
Picture 22.
b. Install cylinder head spacers into both front heads.
apply red Loctite (271) to the first three threads
and tighten to 14-16 ft-lbs (168-192 in-lbs).
c. Install small vacuum hose between front head and
front intake manifold. See Pictures 22 and 23.
9
CAUTION
CAUTION
CAUTION