Looking for a little more bottom end. Need a trail friendly quad but mostly ride in the Oregon Dunes. Not all that into drag racing although we do it now and then. What do you guys suggest? I realize I should upgrade the cam, would I get that much gain out of going oversize valves? I know I can get more bottom out of a big bore but dont want to stroke it at this time. Which ones are good and which ones should I stay away from?