Good Afternoon ABC members. I have a 79 R45, and the front discs has grooves around them just from usage. My questions:

Can I or should I resurface motorcycle discs like I would a vehicle disc? I know my allowable thickness limit is 8MM.
Has anyone done this?
Is it safe to do so on a motorcycle?

I just looked at EME and Discs with new brake pads came out to over $500 dollars. Not even my Volvo front disc and pads are that much. I want to get peoples thoughts and recommendations. If you have a discount code for EME let me have it! Ha! Thanks 

V/R Eric