Well I've heard of at least a couple folks sanding down valve shims to get the clearances perfect, so my buddy and I did it last night on his sportbike (Kawasaki ZX-9R if anyone cares.) The bike has the same shim-under bucket design of our bikes but uses 7.48 shims rather than our big 9's. We just set a sheet of wet 400-grit on a flat piece of metal and sanded away. They are really hard and it takes about 5 minutes of intense sanding to get them down a few hundredths. This allowed us to get the clearances right in the middle of the range, which the factory .05-incriment shims prevented. We've only got a couple rides on the bike, but so far it is working flawlessly. I'm going to save myself some money and do the same on my WR this weekend, since both my exhaust valves are .01 tight. Does anyone see any problems with this? I'd love to hear from anyone else who's done it.