Yes, I found out that is a motor problem, by pulling the R-Spec wires when I have the FVT ESC plugged accelerating, it makes the motor clog a bit, so I guess there’s some partial shorting that is generating all that heat, also the upside is that the VESC works! I have to re-heatshrink it again and keep it ready for when the motor arrives!
Edit - update:
I replaced the RSPEC+ with the sensored 6374 from esk8-de, the motor detection is ok, I’ve also tweaked start RPM a bit more and it seems to start better, I still haven’t tested it on the streets because I had to go on holiday and I couldn’t bring it with me. I also ordered a sensored cable so I’ll try it sensored as soon as it arrives, I’ve read on endless-sphere and on another forum that sensors helps not only smoother startup but also braking as well and I’m willing to test the difference asap.
Here’s a pic I posted on another thread of my boards MKV2 and MKV1 side by side: