I run the sct 3800kv combo in my crt .5 and the motor runs great in it and never breaks 130f. I have it geared for 50mph with 1/10 buggy tires and the standard length chassis.
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.