I dug this thread up and it helped get me going. only thing was I couldn't believe how far in I had to screw in the low speed needle. I got that thing screwed about all the way in. It's exactly 1/2 turn from being botomed out.
I flew 2 tanks through it today and no probs , it took me an hour to adsjust needles but seems good now.

10 YEAR OLD gp 40