I'm thinking about a project for the winter of a new higher compression piston and a Hot Cams stage 1 cam for my 650R. I am curious how big of a power increase I will realize. Is it as big a difference as stock vs. uncorked? Will I win a drag race vs. my brothers crf 450? My only concern is durability. I'm sure it will decrease, but I havent been able to quantify by how much. I assume valve adjustments and head gaskets will become more frequent. I'm sure someone here has done this. Clue me in!!!