brushless motor problem help required!!

[quincey]

ive got a nosram istc matrix speedo and an orion vortex 6.5 brushless motor in a hot bodies d4,now the problem is that the motor is stinking hot and the speedo isnt?.
when you rev the motor it sounds rough(it has done since new but i thought that was standard) and smells a bit at first i thought it was due to the fact there was no vent hole in the shell-so ive cut a load of holes and slots in the shell-motor still hot.
then i thought the gearing was to high i changed the pinion from the 16 to a 19 still motor to hot.
just changed the motor to a 10.5 turn and the motor is now just warm is this right? and whats up with the vortex?