Progressive front fork springs YSS - Yamaha FZ6 600 N / FZ6 600 NA ABS / TDM 850 / XT 660 R / XT 660 X - YSS

Progressive fork spring set - YSS for Yamaha FZ6 600 N (2004-2007) / Yamaha FZ6 600 NA ABS (2007-2008) / Yamaha FZ6 600 NS (2005-2006) / Yamaha FZ6 600 S Fazer (2004-2008) / Yamaha FZ6 600 SA Fazer ABS (2006-2008) / Yamaha TDM 850 (1996-2001) / Yamaha XT 660 R (2014-2016) / Yamaha XT 660 X (2014-2016).

Product Description:

- YSS inner fork springs are stiffer 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: 530 mm;
- Diameter: 36 mm;
- Spring rate 1: 5.1 N/mm;
- Spring rate 2: 7.4 N/mm;
- Left air chamber: 160 mm;
- Right air chamber: 160 mm;
- Recommended viscosity: 10W.

The complete application list can be found below.