Mamba Max ESC doesn't do sensored, only sensorless. You need something from the CM36 line, or equivalent. It has a max of 3S.
http://www.castlecreations.com/products/mamba_max.html
However according to the SC advisory, it seems that the MM can run with the 2650.
http://www.rc-monster.com/forum/newr...reply&p=382715