Hi guys, im sitting in cooke city and my buddy has an 07 rev 800 and it loads up on the bottom end real bad. it did this last season so this summer he cleaned the power valves and had his secondary clutch rebuilt. It ran perfect back home at sea level. now we get it out here and its loading up again on the bottom end. Any suggestions would be great so we can try to get this thing running better. Thanks in adavance