Here ya go people, top is a Hot Cam for the XR650R and bottom is the stock 700XX cam. Looks like ya just press the hubs off and swap the decompression mechanism over!
http://i60.photobucket.com/albums/h15/Bo_White/xxcam1.jpg
http://i60.photobucket.com/albums/h15/Bo_White/xxcam2.jpg