mm + 4600 motor temp near 200 with rustler

[pullinteef]

I also think you are undergeared. I was running a MM/5700 in my B44 geared 14/84 for a while, and things ran hot. I tried going to a 16 pinion and as you noted, things got relatively hot even faster, but I did not really test for long enough to see if the temps continued to rise. Finally I did some testing and went to a 19 pinion and everything ran much cooler, and had nicer top end. Turned out I was way undergeared (about 30% too low on the pinion. I would just try even higher pinions for a short time, testing the temps every minute or so just in case.