36-80 rotor damage
 

After fighting my backplate for awhile i finely figured out a slick way to hold it on. but while working on it i took my rotor out and found this

http://i71.photobucket.com/albums/i1...2/IMG_2038.jpg

the motor still runs fine. Is it safe just to take the rest of this off or should i just run it like is or?

From the pic it looks like the carbon wrapping came apart? I would get some carbon or kevlar thread and re-wrap it yourself. Search around the forums, there are some threads about wrapping rotors, what glue/epoxy to use, etc.

can i just peel the rest of it off and run it without it?

Noooo!! Don't do that! Its what helps keep the rotor from flying apart and taking out the windings in your motor when it does. Simplest thing to do is take some epoxy and go over the area where the piece already fell off to help prevent more from coming off.

If you're going to take more off, take a hobby knife and cut around the base of the part that already fell off. This will help you take off the "chunk" that didn't break off without disturbing the rest of the wrap. If you don't want to or can't find some carbon/kevlar thread to re-wrap that section, apply a little expoy at the edge of the old wrap to help keep it from coming undone.

That's a Medusa motor, right? You might want to call Neu and see what they think. They sell/service Medusa motors now so they could provide some insight.