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 3)

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E- Repeat Steps A-D for remaining valves and record all measurements. Be sure to keep track of all parts during assembly to assure they are
installed in the same location and with the same valves clearances they were measured with.
4- Adjust installed spring height for all valves to 1.860" ± .010". If spring height is too high, place shims under lower collar to achieve correct spring
height. Shims are available from S&S®. If spring height is too low, grind valve or valve seat, or machine bottom of valve spring pocket to achieve
correct spring height. Special valve spring pocket cutting tools are available from various tool manufacturers.
NOTE: Installed spring height is height when valve and spring are installed and in closed position. Correct installed spring height for S&S PN 106-5909 &
900-0050 is 1.860" ± .010".
•
Installing springs at height less than recommended dimension will cause rapid spring fatigue resulting in possible engine damage.
Engine should be frequently disassembled for spring tension measurement.
•
Installing springs at height above recommended dimension will decrease spring tension resulting in possible valve float and engine
damage.
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Failure to establish required clearances may cause valve seal failure and other, more extensive engine damage not covered under
warranty.
Valve spring assembly is under considerable tension when compressed and is potentially dangerous. Wear eye protection and take due
caution when checking for coil bind and during installation. After assembly, carefully strike tip of valve stem with plastic hammer to
insure that keepers are seated. Direct spring assembly away from face and body during this procedure.
5- Install valves, valve seals, and valve springs in heads. Install all S&S® springs with smaller O.D. toward top collar. Be sure valve guide seals are in
place. Install top collar and keepers.
NOTE: Installed height should be the same for each spring assembly.
6- Confirm that rocker arm does not contact top collar. This is most likely to occur when valve is fully closed. Clearance should be at least .040".
7- Confirm rocker arm to rocker cover clearance.
A- Install pushrods and rocker assemblies. Adjust pushrods per manufacturer’s instructions.
B- Place thin deposit of clay or putty on inside of top rocker cover directly above pushrod and valve spring areas.
C- Install top cover and rotate flywheels two complete revolutions (720°).
NOTE: Do not force engine if resistance is encountered. Instead remove top cover and determine cause.
D- Remove top cover and examine clay for indentation caused by rocker arm. Thickness of clay beneath indentation should be at least .060”.
Carefully remove metal from cover or rocker arm to obtain correct clearance.
NOTE: Remove minimum amount of metal needed for correct clearance. Care must be taken not to break through rocker covers or alter rocker arm heat
treatment by overheating while grinding. Oil is supplied to top end through pushrods and rocker arms, so it is also important not to disturb oil passages.
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.
CAUTION
WARNING
Dimension A: Installed spring height must be adjusted to 1.860" ± .010".
Dimension B: Must be .060" greater than valve lift for camshaft to be used.
Figure A