Having some serious chatter going on up front on my 900 rr. At low speed its ok but slowing down from highway speed it chatters. This happens during hard braking and gradual braking. I havent dug into it yet but plan to soon, I really doubt that yhe rotors are warped and the fork seals are fine, and have a strange feeling it may be the calipers, any input would be greatly appreciated.

 

I seriously doubt it's the calipers - that's teh last place I'd look, the rotors would be the first place I'd look as they my not "look" warped, but most likely are. Also check the pads, bleed the lines, check teh head bearings and race, and every nut & bolt.