I'm thinking that I am going to a Big Bore kit for my 2006 RMZ 450. I have to redo the top end and have always been looking for just a bit more power (I'm huge compared to 165# moto guys).

First question is what info about Big Bore Kits and second question is do I have to worry about jetting changes? I run a DR. D pipe on it right now, any worries there? Just trying to make sure that I'm OK if I decide to go bigger.
Thanks!