CCNeu 2650: Will it work in E-Revo?

It should work fine, but............it all depends on gearing.

Let temperatures be your guide.

Gear it for about 40mph. If your temps are too high, then gear it down.

If your temps are running low, then you have head room to gear up some more if you want

This is correct. I ran a Medusa 60-2000 for months waiting for the MMM motor, and had no problems, in my E-revo. I would run it 45 on 4s, or 50 on 5s, with all sorts of tires. It's a smaller motor then the 2650.

I ran a Medusa 36-80 2200Kv in my E-Maxx on 4S, and my Maxx weighs about 12.5 pounds RTR. It worked, but not very well. Had high temps, not a hell of alot of power, and it eventually catastrophically grenaded (shaft broke, tore the motor can in two places).

If there was a problem with the 80, in that, with any tires, it was a bad motor from the beginning.