I have been riding big blue around today and noticed it has been bogging on the low-mid but from mid to top it runs great. I have pulled the choke slightly and it bogs even worse so that leads me to believe that it is running rich down low.. It idles fine and seems to rev (no load) fine but it feels like bogs from idle to 4500 then after that it runs normally.. I have adjusted the Air screw, the drilled out brass plug one, out 2.5 turns from stop. should i lean this a little?