We past through Florianopolis few months ago in a pouring rain, so don't really know how big or modern it actually is.
The best is always go to some local biker community or club. I reckon if there's no parts locally they can ship them from closer Curitiba or Sao Paulo (both we saw and are very modern metropols) with just few days delay.
The most helpful people we've met on the road are from Brazil so far, so don't hesitate to ask from local bikers, even if you don't know the lingo - just point your finger on your chain, they'll understand  . I had my rear shock blown after hard jungle offroad close to Salvador and in some farming city I could get VERY rare parts for the shocks shipped from Sao Paulo within 3 days.
Take care and enjoy Brasil while you can! (it's our highlight country in S-Am, especially the north part so far!) Margus
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