Does anyone know where the best place to look for a CBR 900RR engine, or rebuild kit? I have a 1993 CBR 900RR that has a few bad valves and a couple bad piston rings so far that I know of. The engine didn't give much warning before it wouldn't start anymore. I started it and it was running fine and it just started sputtering after a minute, than didn't run well. So, I left it for another day, and it wouldn't even start. I have yet to dig into the bottom half.