S&S Cycle Sidewinder Valve Spring Kits for 1984-04 Big Twin and 1986-03 Four-Cam Engines (PN 90-2069) - Manual (Page 2)

The safety of the motorcycle rider is dependent of proper
installation of this product. If you are not certain of your
capabilities or do not have the correct tools for this
installation, please consult a shop to have it done. Improper
installtion of this product could result in injury or death to
the rider.
S&S ® valve spring and collar kits PN 90-2069 accommodate
valve lifts up to .585” using standard length, 5 ⁄
16
” diameter
valves, and are compatible with stock style valve guides and
valve guide seals. These spring kits are available with S&S Super
Stock
® cylinder heads for Harley-Davidson ® Evolution ® and Twin
Cam 88 ® engines.
NOTE: Spring kit components are not interchangeable with those
from other S&S valve spring kits.
Mixing of valves, springs or collars between S&S Sidewinder ®
springs and other S&S spring kits can cause extensive engine
damage not covered under warranty.
Installation of PN 90-2069 spring kits does not usually require
modification for S&S or most stock heads. Exceptions are Buell
®
Thunderstorm heads and certain Sportster ® models and big twin
heads with different machining in valve spring pockets. In such
cases, removing a small amount of material (approximately
.030”) from O.D. of S&S bottom collar should allow collar to rest
flat in spring pocket for correct installation. It may be necessary
to machine the valve spring pocket deeper to achieve the correct
installed height when installing springs in Twin Cam 88
® cylinder
heads.
PN 90-2069 spring pressures are as follows at 1.800” installed
height: Closed valve - 125 lbs; .585” lift - 330 lbs.
Spring Installation Procedure
1. Remove heads from engine and disassemble. If cylinder
heads/valves are to be reconditioned, proceed at this time
according to standard procedure. Refer to Harley-Davidson
®
service manual as necessary.
2. Place lower spring collar in valve spring pocket in head.
Place spring on collar. Collar must sit flat on cylinder head
and spring coils must not contact sides of spring pocket in
head. If necessary, machine lower collar and/or spring
pocket to obtain minimum clearance of .030”. Do not
modify spring in any way.
3. Using following procedure, determine installed spring
height and clearance between top collar and valve guide.
A. Lubricate valve stem and install valve in guide.
B. Install bottom collar, valve seal, top collar, and valve
keepers. Pull top collar tightly against keepers to seat
keepers in collar.
C. While holding valve firmly against seat in closed
position, measure installed spring height (distance
between lower valve spring seating surface and outside
step of top collar). See Figure A, Dimension A. Record
measurement.
D. Measure distance between top collar keepers and top of
valve guide or seal (if applicable). See Figure A,
Dimension B. Distance must be at least .060” greater
than valve lift of cam to be used. If dimension B is not
.060” greater than valve lift, valve guide must be
shortened to obtain required clearance.
Dimension A:
Installed spring height must be adjusted to 1.800" ± .010".
Dimension B:
Must be .060" greater than valve lift for camshaft to be used.
Figure A
CAUTION
2
WARNING