Well I don't no what to do anymore, I think I tried everything. When I'm rolling down a path and hit the throttle its bogs down almost like it's sucking in too much air and as soon as power band kicks in "kinda have to play with the throttle" hang on cause it hits strong and hard all the way to top. Now I checked for leaks in the boots, reeds look ok and the carbs are in sync close as I could get them. It has a k&n pro flow filter with a closed box, FmF fatty pipe and silencer. TORS removal (Mikuni) and as far as I could tell the engine is stock. 290 mains, 27.5 pilots and stock needle on 3rd clip. Tried different spark plugs(BR8ES) and the stator is new. I tried moving the clip on the needle down to the 4th position and can't tell if it made it worse. Oh and I've tried every position for the air screw and gas is flowing good. I live in PA Coal country Hazleton/Wilkesbarre 1,943ft Elevation. Do you think I should try moving the needle to the 2nd clip position? I don't know what to try anymore. Any help would greatly be appreciated.