For sale is a rear shock upgrade I bought a couple of years back and never got around to fitting, and now I don't have the FZS600 any more, seems pointless keeping it!
Made by Betor, it has adjustable pre-load and compression/rebound through the bottom screw adjustment. That's about all I know and it sat in the shed for 2 years.
£50 ONO + P&P and it's yours.
Located near Selby, N.Yorks for those that may be local (20 miles from Leeds and York).