I just went through my10th tank and encountered issues. The engine at first worked great, with lots of power, low idle, and fast starts. Usually I could get about 10 to 11 min per tank.

However, problems started to occur with holding a tune. I tried to re-adjust the LS and HS needles except now the settings were out of whack. The HS works at 1/2 turn and the Ls works at 2&1/2 turns. Initially the needles were working fine for the LS at 4&1/2 and the HS at 5&1/4.Now after 6 minutes of driving the engine gets excessively lean and as a result it stalls.

After some thinking I believe that the front bearing is out allowing for an air leak especially after the engine heats up and the metals expand (that is why it gets worse at 6 min). Look at the video on YouTube and please tell me what you think. I believe that I have a massive air leak at the front bearing (soap water pressure bubble test). Is this something common with Argus, go and Alpha engines or I just got a dud. I do not mind replacing the front bearing, but it seems strange that it would happen this soon.

(type w w w. before the youtube address to see the video)
youtube.com/watch?v=S_UcwnGQ0-Q