Yea Im glad I found this thread
My symptoms are slightly different, probably due to luck, from everyone elses, although I believe the solutions are the same.
My 47 idled ok, died in the pits ok, transitioned fair, screamed on the top end. If I did any aerobatics it would surge and act up a little. however, the weirdest symptom was if you turned the HSN it had little to no effect. It would kill the engine at appx. 1 turn out. Any thing more than that and the engine would scream, all the way to the needle litterally falling out in my hand! After reading all this it still stands to reason....fuel starvation. Just drilled my carb, fixin to run it in the yard to check it out. Will get back to ya
Thanks
Shane