Ditto. I run a 5.5t with a 16/62 gearing and I'm only hitting 150-160 on a large 8th scale track with long straights. Goign from 14t to 16t didn't change my temps at all...14t may have been slightly undergeared, and 16t might be slightly overgeared to keep the temps as low as possible for my truck and track, but I like the extra speed I get, and temps are still well within acceptable limits.

Though 235 sounds hot, even for an undergeared LRP. (LRP motors run a little warmer than Tekin or Novak motors in the same setup.)

I would check for binding on the hubs (wheel nuts tightened too tight) as well as in the gearbox/motor plate. The 3 screws that hold the gearbox together can protrude and rub on the internal components of the main driveline.

Lastly, how tight is your belt? If you run it too tight, that can add extra heat as well.

With a 4.5 geared so low, you would have so much torque you may not notice this other binding...