I have an '89 XR600 which has a complete '93 XR600 front end. This includes the fork, tire, brake caliper, hoses, master cylinder, rotor, etc.. When I first did the conversion about 1 year ago I purchased a brand new aftermarket rotor and some aftermarket pads. The pads never seemed to wear onto the rotor properly. Only half off the pad was actually touching the rotor on both sides (outer half), and it started grooving my rotor right away. It also made a scratching kind of sound when I slowly spun the front tire, but only after it started to wear in a bit (not when I first installed everything). I took it all apart a couple of times and could not find anything wrong or out of place. So I purchased a new set of Honda OEM front pads, and new pad retainers (forget what their called). I installed the new parts, and after about 20 miles, I noticed the pads were definetly making almost full contact with the rotor. I have had them for about 150 miles, and I have once again noticed more deep grooving in the rotor, and when I spin the tire it makes the scratching sound again. I even found a little tiny chunk of metal embedded in the rotor. But the grooving is across the entire surface where the pad touches on both sides. And once again, when I first installed everything it worked great and spun real nice with no noise. I also replaced the rear rotor and pads with aftermarket parts about a year ago and they are wearing very nicely. The front caliper is working great, and the lever is very solid. There is no air in the line. The brake is not sticking or anything like that either. It is stopping OK. I am not really sure what to expect on an XR. I only have experience with the stopping power of the newer motrocross bikes, and it definitely does not stop anything like that. I really don't know what else I can do. I could always replace the rotor with a better quality brand, but I would hate to destory another rotor. Any ideas or suggestions? Thanks.