You might also look up the manual on the 'net. I bought the same engine. The old pros at our field said the same thing that you did. It turned out that the starting point for the AX was, maybe, 1 1/2 turns. They started tuning it at 4 or 5 turns...and never got down to 1 1/2 turns......They thought 4 or 5 turns was correct since since the FX was set that way. When we started all over with the factory settings, everything worked just fine. Rich