3pm radio, old system, 75mhz. I believe it'll work cuz my M8 still works with newer ESC and motors. Read you Mamba Monster X manual, part that tells you how to calibrate your ESC. It tells you where the Neutral, Full Throt, and braking position are. I think the problems are there. especially when you change ESC and motor. Brushless system depend on calibrations. Good Luck!! Caps are good but I don't think you'll need them, I may take some responds of my comment! Its ok.