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hi all quick question can a brake disk be skimmed as one of my fronts is warped

I wouldn't......

Theoretically - yes. But as the service limit is only 3.5mm and as new they are only 4.1mm by the time you've skimmed an amount off sufficient to cure the warp they will be below the service thickness.

Are they OEM? I've heard lots of stories that you get what you pay for with discs and although pattern are cheaper a lot of people seem to have warping problems.

Another tip to avoid warping is not to hold your front brake on when you've stopped after heavy braking, hold the bike with the rear if needed. The heat builds up in the pad and when you stop, if you hold the brake on you have one small contact patch of intense heat on one point of the disc, which causes the warp. Advice courtesy of the Blingmeister, Mori Man

thanks mate how much are oem disks looked a ebh but are way to expensive

New I think about £160 each. Easy way to find out just ring Cradley Kawasaki and ask. You could try a second-hand set from a breakers but I'd want to be measuring them before I parted with cash to ensure 'part worn' doesn't equal ' almost on the wear limit'