S&S Cycle 590 Lift Valve Spring Kits 90-2060 and 90-2063 for 1948–1984 Big Twin Engines User Manual

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NOTE: With valve, collars, and keepers assembled and installed in head, installed spring height is distance from bottom of outside step of top collar to

top surface of lower spring collar. See Figure a, Dimension a. This distance is same height as outer valve spring with spring assembly installed
and valve in closed position.

A. Apply thin coat of assembly lube or motor oil to valve stem. Install valve in guide, followed by lower collar and valve seal if applicable.

B. Install top collar, and valve keepers. Pull top collar tightly against keepers to seat keepers in collar.

C. Measure installed spring height while holding valve firmly against seat in closed position. Record measurement. See Figure A, Dimension

A. Correct installed spring height for S&S kits #90-2060 and 90-2063 is 1.480" ± .020".

NOTES:

• If spring height is greater than 1.500", place shims under lower collar to achieve correct spring height. Shims are available from S&S®. If spring

height is less than 1.460", late ‘81–up heads may have material removed from machined spring pocket to achieve correct installed height.
Otherwise, grind valves or seats to increase installed spring height.

D. Measure distance between bottom of keepers and top of valve guide or seal. See Figure A, Dimension B. Measurement must equal or

exceed valve lift + .060". In other words, for .590" lift cam, measurement B must be at least .590" + .060", or .650" total.

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 same location and with same valves that clearances were measured with.

NOTE: All four spring assemblies should have same installed height.

Remove seal and grind

guide here to obtain

greater measurement B.

Dimension A:

Installed spring height must be adjusted to 1.480" ± .020"

Dimension B:

Must be .060" greater than valve lift for camshaft to be used.

Figure A