Multiplex 3D has a very high rpm per volt (4,180)
Multiplex 4T has a lower rpm per volt (3,170)

Both engines cost $70
Which one is better?
Do you want more or less rpms per volt

I will be using a castle creations phoenix 35 with this motor
Still wondering about those batteries?
Does the 9 tooth pinion come with the $99 conversion kit from lite machines