Couple of issues wih my Mamba Max

[BrianG]

I take it you're running 4s? That's a pretty good total gear ratio (15.3:1) considering it's a buggy. Ratios in the range of 9:1 to 11:1 are more common so it's not a gearing issue. It sounds like the 7xl is simply pulling enough average current to heat up the ESC quickly. Can't forget the MM is a 10th scale ESC meant for lighter duty use and smaller motors, so you might just be stuck using a fan or adding more heatsink area.