S&S Cycle Valve Springs — 1984-2004 Harley-Davidson Sportster Models

S&S Cycle Sidewinder .650" valve spring kit for 1984-2004 Harley-Davidson Sportster models, engineered from Kobe alloy wire and nitrided for durability in high-RPM applications. Includes chromoly forged retainers, keepers, collars, and shims for a complete valve spring upgrade.

Features

• Kobe alloy wire with micro shot peening and nitriding
• High-performance conical single-wire spring design
• Chromoly forged retainers with CNC-machined 9-degree locks
• Complete kit: springs, keepers, top and bottom collars, shims included
• .650" spring height for stock and S&S Super Stock heads

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 900-0050
• Weight: 1.35 lb
• Category: Engine Components / Valve Springs, Retainers

Fitment

Fits 1984-2004 Harley-Davidson Sportster models. Compatible with Twin Cam 88 Big Twins using stock heads (7mm and 5/16" valve stems) and all S&S Super Stock heads (5/16" valve stems).

Frequently Asked Questions

Does this kit include everything I need to install?

Yes — the kit includes valve springs, chromoly forged retainers, keepers, top and bottom collars, and shims. No additional parts needed.

Will this fit my 2005+ Sportster?

No — this part is for 1984-2004 Sportster models. Newer Sportster generations use different spring specifications.

Can I use these with aftermarket cylinder heads?

These are designed for stock Harley heads and S&S Super Stock heads. Verify compatibility with other aftermarket heads before ordering.

Do these require valve job or head work?

Installation requires removing the cylinder head and valve cover. Professional machine shop service is recommended unless you have engine rebuilding experience.

What valve stem sizes do these fit?

Compatible with both 7mm and 5/16" valve stems found on stock Twin Cam 88 Big Twin heads, and 5/16" stems on S&S Super Stock heads.