Hey guys. I got a 02 YZ426 in SM trim. Im racing at a road race track and I seen to need a bit more power. I can pull away from the guys in the turns and even have a better drive off the corners only to have them catch me on every straight. The other bikes are 450's with motor work done as well. All i really have done to my bike is the standard free mods and a full exhaust system. Im planning on doing the motor after the next round and trying to figure out what would be a better way to go. High comp piston, Big bore, or maybe even both? Im wondering if anyone has done this before and if it would be at all reliable for running on a road course at higher RPM's most of the time. Any help would be great. thanks guys!