New fzs600 rider who is heavy

[darrsi]

The FZS600 has a recommended top weight limit, with everything included (top box, passengers, etc) of 29.4 stone (187kg), so the bike is more than capable, but the rear shocks are notorious for pegging out around the 20,000 mile mark.
As said above, a replacement rather than a refurb is probably your best option but unfortunately it's one of the few things on these bikes that are not cheap to sort out.
Once done though the results can only be to your benefit and are certainly worth splashing out on.