When you install a higher compression piston and CAM does the timing have to be adjusted any different? I am changing from the 249cc/9.5:1 to a 263cc/10.5:1 piston and installing a stage II HotCAM. I am taking to the Yamaha dealer to have the work done, they should know what to do right? I am providing the top end gasket kit, and am also getting a valve adjustment done at the same time. I assume there will be a break in period involved as well?