I had tried a Eflite 370SD for BCP replacement motor from my LHS while I waited for a replacement from Exceed. It had an 8 tooth pinion. 8 tooth pinion on a 370sd motor meshed to a Eagle 50 main gear doesnt produce enough headspeed to fly. No matter what you do to the pitch and throttle curves, it will only hover at best, and you will probably burn up the motor trying to figure it out. The Exceed motors have a 9 tooth pinion on them and that makes all the difference in the world.