MM/5700 Issues

[Skelbow]

My cousin recently purchased a MM/5700 setup for his rustler.

Running a 9-cell 4700 pack with maxx sized tires, run great for the first 3 runs.

Then we took it to a construction site, with dirt and really hard grass, and it run fine for about 3 minutes. After that 3 minute run, my cousin stated that the motor was really hot, and the ESC was pretty damn hot too. We let it cool for a good 20 minutes, but it still not not want to work.

Upon me checkin on it, and trying a Warp4 2 Turn BL motor as well as a 7XL with his mamba max, the ESC works perfectly, but as far as I can tell, the 5700 motor is cooked (and it kinda smells that way too)

Has anyone else had this problem? 4 runs and the motor fries?? He has had really bad luck with Castle as of late... he has a 8000kv setup in his Mini LST, and he fried the motor in that the other day too (I haven't doubled checked that yet, he said smoke came out of the motor... so I figure it isn't good)

He is at the point now where, he is going to trade most of his RCs in (probably later today) and either get a nitro or lookin at a new EMaxx.

Any info is appreciated
-Cory