Need to rebuild top end of wr426

I did a search of the site for info on this subject but it was too busy and kept kicking me out. Help! Had some problems with the bike not running well so I bought a JD jet kit and installed as directed. It didn't help, so frustrated I took the bike to a well recomended mechanic and he tore into it and discovered that the bike's intake valves were shot and it was "popping" back through the intake. He said that it needed a top end rebuild and with the wear that he saw there he was assuming the there would be some issues with the bottom end as well. I am pretty good mechanically and have someone that can help me that has rebuilt several bikes but never a 426 so I was hoping that someone here could point me in the right direction.

thanks,

Diego

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