Sorry for the wrong number:
104F -> 144F
I have made a correction.
Thank you for the reply
The gearing 72/15 is suggested for C50 MAXX by Hacker, yet I don't know the case for the 10L motor.
I would try to run it longer and see if the temps go up much. My Neu will hit 140 pretty quick, but at the end of a battery (15min run) it only gets to about 170. Steve Neu (owner/creator) of Neu motors says there is no potential damage to Neu motors until it reaches 220. I don't know if that's the case with a Hacker.