Reducing the diameter of rotors?

[sharky]

I have a set of front brake rotors off a ZXR400-L that I have tried to fit to a ZXR400-H. The diameter of the L rotors is a few mm bigger than the H. I can't quite get the callipers to mount over the top of them. Machining a few mm off will solve the problem.
-Anyone done this before?
-Know who I could get to do this in Auckland, pref North Shore?
-Know of any reason why this shouldn't be done?
-Idea of cost?

Cheers

[R6_kid:Me]

You'd want to keep them pretty cool when you do it. I can imagine that machining a disc would create a fair bit of heat which may lead to you buggering the disc in the process.

[GaZBur]

I got my disks machined from 300mm to 290 as part of my motard conversion. The engineering place said its no big deal unless it is a floating disk like mine was - then its a bastard. Get a quote first like I did as they said it was a bigger job than they expected.

Plug here for GJS engineering in Dunedin who converted a set of 17 inch mags off a GSXR for my motard so that it only takes half an hour to convert the bike as disks and sprockets all line up with the standard configeration.