Looking at a used 2016 Stone. Original warranty is two years, should be transferable, correct?
Yes. I've made successful warranty claims on all three of my V7's while they were still under warranty (all three bought pre-owned less than two years after original sale.
The 2009 V7C had a cold idle problem, got re-flashed under warranty.
The 2013 V7R had a leaking rear shock, got it replaced under warranty
The 2014 V7S had a severely discolored muffler from overheating at some point (was that way when I got it). That was also replaced under warranty (thanks WaltR @ Europa Macchina for going to bat with MG for me).