S&S Cycle 650 Lift Conical Valve Spring Kits for 1984–Up Big Twin and 1986–Up Four-Cam Engines (PN 106-5909 & 900-0050) - Manual (Page 2)

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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 106-5909 & 900-0050 accommodate valve lifts up to .650" using standard length, 5⁄16" and 7mm diameter valves,
and are compatible with stock style valve guides. These spring kits are available with S&S CNC ported cylinder heads for Harley-Davidson® Twin Cam
88®, 96™, and 103™ engines.
NOTE: Spring kit components supplied in these kits 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 106-5909 & 900-0050 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. It may be necessary to
machine the valve spring pocket deeper to achieve the correct installed height when installing springs in your cylinder heads.
PN 106-5909 & 900-0050 spring pressures are as follows at 1.860" installed height: Closed valve - 178 lbs; .650" lift - 376 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 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, top collar, and valve keepers. Pull top collar tightly against keepers to seat keepers in collar.
The keepers must be located in the groove closest to the tip of the valve. Any other groove will yield the incorrect installed height and may
cause premature valve train failure. S&S is not responsible for incorrect installation. Consult an S&S dealer or S&S Sales Representative if
you have any doubts as to the correct installation of this product.
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.
WARNING
CAUTION
CAUTION