[mrunderhill1975a]

Hi all, a friend of mine is trying to restore a 1980 Hondamatic. He has the carbs sorted but found there is a warp in the brake rotor.  In my day, we would take the rotor off and any brake shop or parts store would be able to put the rotor on a lathe and turn the rotor until true.  Does anyone do that anymore? I went to a shop recently and the kid behind the desk looked at me like I had two heads when I asked him to turn a brake rotor.

[gizzo]

I don't think that's a thing anymore, especially on motorbikes. discs are so thin, there's not enough material to skim off them anymore. Those old 70's cast iron ones might be a different story and a Man In A Shed might be able to help you out

[High On Octane]

If it is a cross drilled rotor it is literally impossible to turn.  The carbide bit will catch on the holes and destroy the cutting bit and the rotor.  Even still, most bike rotors can't be turned as you cannot mount them to the lathe the way you would with a car rotor.