Thanks to you all, installed a 48 pilot and 170 main from day one. Left the needle/clip position and leak jet stock. Huge improvements. I am in the San Jose, Ca with a temperate climate. Seems to me someone mentioned some testing with the NFLR in the 4th position. Can't locate that data and can't get a feel for what direction, if any to go on the needle or clip. Has anyone tried different leak jets? Or am I there? Pump gas/stock exhaust. Thanks Bob.