I've been thinking about this lately myself. Recently I decided to run mod and the only mod motor I have is an original Novak Velocity 5.5 I took it apart cleaned and lubed it and changed the ancient history rotor (stacked magnets 14mm diam.) for the newer sintered 12.3mm rotor. It ran great and still quite fast and temped at about 160F.

Back in the early days I don't recall people having issues with frying the early motors. I wonder if it is because they were built to some higher standards for durability. Of course back then we didn't have boost. However, my Novak 17.5 Ballistic is already burned out and it barely took 160F the last time I ran it in non-boosted.