9XL headache

[redshift]

I have a buddy with a 3905 Maxx, just put in a 9XL with a MMM, running 14 cell.

It is weatherproofed, so there is no airflow around the motor, and he was running in the slop tonight to test things out, I was running my truck and no thinking about temps on his.... end of a run and the motor is at 215!

Wha?

It seems ok, which is probably a small miracle.

But is the main issue here the fact that he's over the happy 30,000 rpm zone on this motor?

The motor heats up very fast even freespinning the driveline, we tried it after cooling again on my lipos (16.8v) and the heat did not seem to be an issue nearly as much.

Gearing is very conservative 20/68, could it also be being underworked at 21v?