Hi I'm new to the site and also new to 4 strokes. Just got my self a 99 yzf400 with a 426 head on it. It also came with a spare frame and bits and bobs. It needs some work and while stripping the back brakes down for fresh pads I noticed the caliper was different from the spare I have on the other frame. I was wondering if they used different brake setup on the back for the 98-99? Or is it possible I have a 426 frame from 00-02?