I have a ´04 CRF230F that the engine went on. We had just done a ton of work on the top end and something went in the botom end, I think timing chain but am not sure. The valves got a little bent up. The piston looks good and I have had it all aprt but really don´t know what I am doing. I am really struggling with what to do with this bike. the frame and everything but the engine is in great shape. Are there folks out there that sell just rebuilt motors or that could take the engine I have and rebuild it? Suggestions?