Instruction Manual

ManualsBrandsS&S Cycle ManualsFor motorcycles650 Lift Conical Valve Spring Kits for 1984–Up Big Twin and 1986–Up Four-Cam Engines (PN 106-5909 & 900-0050)

 



 

 



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 oat and engine

damage.

 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.

  



NOTE: Installed height should be the same for each spring assembly.



 

 

 

 

NOTE: Do not force engine if resistance is encountered. Instead remove top cover and determine cause.





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.







CAUTION

WA RNING

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