What is the main benefit of using a .650 inch lift valve spring kit?

A .650 inch lift valve spring kit is designed to provide better control over the valves, especially when using performance camshafts with higher lift profiles. This helps ensure the valves close properly and consistently, even at higher engine speeds.

What components are included in this S&S Cycle valve spring kit?

This kit comes with all the essential parts for installation, including valve keepers, top and bottom collars, the springs themselves, and shims. It also includes CNC machined locks and chromoly forged retainers.

What types of Harley-Davidson heads is this kit compatible with?

This kit is designed for stock heads on Twin Cam 88 Big Twins (both 7mm and 5/16 inch valve stems) and all S&S Super Stock heads (which use 5/16 inch valve stems).

S&S Cycle Valve Spring Kit .650in Lift 900-0050

Name: S&S Cycle 84-04 BT/86-03 Sportster Models .650in Lift Sidewinder Valve Spring Kit
Brand: S&S Cycle
Price: 257.63 USD
Availability: InStock

S&S Cycle 84-04 BT/86-03 Sportster Models .650in Lift Sidewinder Valve Spring Kit

$257.63

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

S&S Cycle 84-04 BT/86-03 Sportster Models .650in Lift Sidewinder Valve Spring Kit. Improves valve control for high-performance engines.

Key Features

Fits 1984-2004 Harley-Davidson Big Twin and 1986-2003 Sportster models.
Features a .650 inch lift rating, suitable for performance camshafts.
Constructed from high silicon Kobe alloy wire for improved strength and durability.
Micro shot peened and nitrided for enhanced fatigue life.
Includes valve keepers, top and bottom collars, springs, and shims.
Utilizes high-performance conical single wire springs.

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Will this fit your vehicle?

Product Details

S&S Cycle is well-known for building performance engine components for Harley-Davidson motorcycles. This Sidewinder valve spring kit is designed to handle higher lift camshafts, improving valve control in your engine. It's a solid option for riders looking to get more out of their Big Twin or Sportster engine.

This kit uses springs made from ultra clean, high silicon Kobe alloy wire. They are then micro shot peened and nitrided for improved durability and fatigue life. The springs themselves are a high-performance conical single wire design, paired with CNC machined 9-degree locks and chromoly forged retainers. This combination helps ensure the valves close reliably, even at higher RPMs. The kit includes valve keepers, top and bottom collars, springs, and shims, so you have the necessary pieces for installation.

This kit fits a wide range of Harley-Davidson models, including popular bikes like the FLHTC Electra Glide Classic, FLSTF Fat Boy, and FXD Dyna Super Glide. Make sure to check the full fitment list to confirm compatibility with your specific motorcycle.