I have a 01' WR426 that I bought used and it runs good but id like to rebuild the top end this upcomming winter. for two reasons, so I know its new, and just in case it was maintained poorly by the previous owner(s). I want to go with a larger bore/piston, cams, valves, springs, etc. My question is will I need to get a forged rod if I run a bigger piston? with the engine work as mentioned will the stock carb. with a jet kit be sufficient? Will a new timing chain be nececcesry? Iv rebuilt motors before but not on the newer bikes..I like the vintage stuff its all so SIMPLE! Just trying to get an idea of everything ill have to purchase. Thanks!