Too hot?

[rootar]

well according to the speed caluculator your spinning your motor over 60,000rpm which is bad for the motor, and your geared to do over 70mph, i highly doubt it is running this fast due to the batteries being horribly over worked and them dropping ALOT under load (why your battery temp is so high), the nimh pack you built wont last long if you run it at those kinda temps more than a handfull of times. id switch down to atleast a 5700 motor or even better a 4600 and keep the same gearing and youd be at over 45mph

also leave the start power on high but turn your motor timing to LOW its much easier on 2 poles motors.