Drive motor options

[Liftoff]

Hi there, need some advice/suggestions regarding drive motors for my feather build.

As some might know I'm using track drive on my machine and the motors I'm using are the gimson Gr02 18v. I used these motors as their compact size and little weight makes them ideal.

Unfortunately when the first test drive was done the motors overloaded and almost burnt! Don't think the issue is with the motors themselves but rather with the tracks...they do put some load on the motors even when free wheeling, which increases as you steer.

What I'd like to know is if there's any motor I could get with more power than the Gr02 but which could be coupled to the Gr02 gearbox and of the same length. Diameter up to 55mm is ok, larger than that will not fit....