INSTALLATION KIT# 17-0108
1984-1989 Big Twins and
1986-1987 Sportsters
(Crankcase vented only.)
(See line drawing on page 6.)
1. Remove existing air cleaner assembly and
related hardware, if applicable. Refer to
authorized Harley-Davidson Service Manual as
needed.
2. Prepare air cleaner backplate.
A. 1984-1989 Big Twins - Press plug #50-8312
into hole “B” in backplate. Apply Teflon
tape or thread lubricant to threads and
screw crankcase breather vent elbow fitting
#50-8110 into hole “A.” (See Figure A)
B. 1986 and 1987 Sportsters - Press plug
#50-8312 into hole “A” in backplate.
Apply Teflon tape or thread lubricant to
threads and screw crankcase breather
vent elbow fitting, #50-8110 into hole “B.”
(See Figure A)
3. Mount air cleaner support bracket #17-0311
(two required) from air cleaner support holes
in cylinder heads with
5
⁄16 -18 x 1
1
⁄4” bolts and
lockwashers. Do not tighten bracket completely
at this time.
NOTE - Backplate screws supplied with this kit have
thread locking compond on threads. If screw without
thread locking compound is used, a thread locking
compound such as Loctite 242 must be applied, and
screws properly tightened.
4. Attach backplate to carb and determine number
of shims or washers required to fill gap between
backplate and mounting bracket.
5. Insert
5
⁄16 -18 bolts of appropriate length through
backplate, shims, mounting bracket, and
lockwasher.
6. Tighten all mounting hardware.
7. Insert vent hose connector #50-8111 into end
of existing crankcase vent hose, place S&S
crankcase vent hose #17-0113 over other end
of connector, and secure with hose clamp.
Place second clamp over vent hose and attach
end of hose to elbow fitting #50-8110 in
backplate. Secure with clamp. See Picture 1.
8. Install filter element and air cleaner cover. Secure
with three air cleaner cover screws #50-0072 to
complete installation.
9. Start motorcycle, inspect for leaks, and test ride.
Engine should run smoothly after proper warm-
up. Surging or misfire may indicate lean
carburetion. If necessary, consult professional
mechanic regarding possible need to install
correct carburetor jetting.
INSTALLATION KIT# 17-0100, 17-0101
1993-up Big Twins,
1991-up Sportsters, and
1999-up Carbureted and Single Runner
Fuel Injected Twin Cams
(See line drawing on page 7.)
1. Remove existing air cleaner assembly and
related hardware including cylinder head
breather fittings if applicable. Refer to authorized
Harley-Davidson Service Manual as needed.
2. Assemble both head breather bolt assemblies
as pictured in line drawing.
3. Screw breather assemblies into breather vent
holes in the heads. Do not tighten completely
at this time.
4. Install rubber T-hose #17-0339 over cylinder
head breather fittings with hose tee toward rear
of engine. Hose must not be kinked or otherwise
obstructed, and should be trimmed to length as
needed. Once proper fit is obtained, secure T-
hose to breather fittings with black tie-wraps or
metal clamps provided. (See Picture 2)
5. Tighten the head breather vent bolts.
NOTE - Use Loctite 262 (Red) on breather fitting to
head threads.
B
Picture 1
Crankcase vent hose 1984-92 V
2.
3
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