Machining slotted rotors

['73 H1 Triple]

Originally Posted by racedoll

I was told it was because the material of the pads versus the material of the rotors cause a little magnetism so when it sits, the pads stick to the rotors and they end up "warped".

My old rotors and brakes (OEM) did the same thing. I was hoping a different combination would help but not so much.

I didn't see why they couldn't be machined, if the shop goes slow but just curious if anyone else had experience with that.

It's the interrupted cut that makes machining them difficult. You need a certain hardness in the carbide to cut them and the interrupted cut breaks down the cutting edge.

I thin the rotors on Kawasaki Triples so the EX calipers can be used. Holes and slots cost extra due to additional cutting inserts consumed during machining.

Originally Posted by racedoll

Parking brake would have been engaged but wouldn't that only explain the rear rotors being warped, not the front ones?

Originally Posted by Turbo Ghost

Sweet! A friend just bought a 1989 Virago 250 and the front rotor is so warped it's like a pogo stick when you get on the brakes hard! Not sure if there's enough there to turn down.

.002 ( two thousandths ) of an inch variation in thickness creates a lot of feedback thru the lever.

I'll send a PM with my email address, I might be able to true it up if a replacement can't found.