Progressive front fork springs YSS - Harley Davidson FLSTC 1340 Heritage Softail Classic / FLSTF 1340 Fat Boy - YSS

Progressive fork spring set - YSS for Harley Davidson FLSTC 1340 Heritage Softail Classic (1988-1996) / Harley Davidson FLSTF 1340 Fat Boy (1990-1996) / Harley Davidson FLSTN 1340 Heritage Softail Nostalgia (1993) / Harley Davidson FLSTN 1340 Heritage Softail Special (1994-1996).

Product Description:

- YSS internal fork springs are firmer than the original;
- The YSS progressive wound fork springs are made from high-quality steel;
- This allows for a reduction in wire thickness, making the spring more responsive;
- To improve oil flow in the fork, the springs are fully polished and ground on the top and bottom;
- This also reduces noise in the fork;
- The delivery package includes 2 springs for a complete fork conversion;

Technical Specifications:
- Spring model: progressive;
- Length: 495 mm;
- Diameter: 32 mm;
- Spring rate 1: 9 N/mm;
- Spring rate 2: 14 N/mm;
- Left air chamber: 190 mm;
- Right air chamber: 190 mm;
- Recommended viscosity: 40W.

The complete application list can be found below.