If you are burning I get the feeling you are not using proper riding gear...........
In the city I wear jeans. Textile/cordura pants only when I hit the road. I'm an ATGATT advocate, but even if I were wearing proper pants, that wouldn't have prevented the subframe from getting hot. That could be a design flaw, for its competitors don't present this problem. (We can see there's a piece of plastic covering the subframe in the 250 above...)