I want to know if I can run a 12t and a 21t 550 motor on the 16.8v evx-2 esc for an old emaxx I have.

Will it hurt the esc if I do this? Or will I just have to watch my voltages? The esc is rated to 16.8v but I was told to use the 21t motors cause they can handle the 16.8v and the 12t wont..

Any suggestions??

I also purchased the 775 behemoth motor with dual inputs for the evx-2 but since my emaxx is the old 3906, I cant find any adapters or motor plates running around ebay that will allow me to install it..

Any help in this matter would be appreciated.