I have a 03 YZ450F, which i have turned into supermoto. I am thinking of upgrading the motor a little bit (already have WB Carbon Pro full system, JD jetting and open air filter K&N style). My first thought since i don't want to spend a lot of money, was to buy a big bore kit from Cylinder Works or Max Power at 478cc. As far as i can see these kits come with a standard compression piston. So, do you think that a higher compression CP 13:5 with the big bore kit will work better or not? I am thinking that it might require other cams or head porting... Also has anyone installed a CP piston with a Cylinder Works cylinder (i see that CW comes only with Vertex pistons)?