I have a pair of oldschool repu rotor housing they seem to be clean no grooves or scratches but they have some weird stains on them.could it be heat spots? and if it is can they still be reused and get good results?thanks in advance for any help





The rest seems fine

 

Those are smooth?? They look horrible, looks like a bunch of carbon got wedged and scratched it. Can you take a pick or flat screwdriver and feel anything? Cause i wouldn't want to use them

 

I'd consider those to be in phenomenal, never-ever-see-them-that-good awesome condition. Then I'd hit them with a little emery paper to verify flatness and use them.

 

I been holding on to these for my repu and now that I'm getting ready to start building the motor I was worried about the weird looking spots.
They are smooth all the way around can't catch anything on them,just stained from something.
I will see if I go over with some fine emery board and see if it looks any better after.

 

they look to be in great shape I would use them I would just clean them up with a little emery cloth

 

a glass bead blast should do
.. being where it is then suspect maybe it is teflon or some other additive residue ?