revo motor

[lincpimp]

the 8 or 9xl would be a good choice seeing that he will be using nimhs. Keep in mind that unless those are new high quality cells that you may overheat the whole combo. Most nimhs can't keep up with a good brushless motor, the amp draw is too much for them. I would try the 9xl and gear for about 30 mph. Not sure if you will get 40 out of 12 cells, not without alot of heat. definately use the motor clamp/heatsink, it is a must have. Will he be using a emaxx tranny or the stock 2 speed revo tranny. The 2 speed may help with temps as the lower 1st gear ratio will take some strain off the motor.