I have over geared it to try to get it up to about 120-140kph.(75-85mph).

I think the MambaMax 5700 motor might be a tad small for this gearing. This might be why the controler is getting pretty warm.

I have it locked into second gear eliminating first all toghther.

For this over geared ratio would something like a Lehner 1930 or 1940 be bettter suited or will I have to go even larger motor again.
I still want the motor to run aup to about 40,000rpm and still run on 11.1V

Anymore infomation is appreciated.