Im hoping for a bit of advice on a new project I have. I reciently purchased an AT-6 and a new TT .46 pro. I ran a tank full through per instructions and then another for good measure. at the 2.5 turns out of the needle which is supposed to be the starting point, the engine starts well but dies abruptly at about 2/3 throttle(lean I guess). Turning the needle out a couple more full turns allows it to get to full open but when I tip the nose up it dies. If i turn the needle out until it almost falls out I can get it to keep running with the nose up but it sags a bit. It wont run at all nose up unless the fuel tank pressure line is disconnected from the muffler. Im baffeled. The tank is installed per instructions. I have a reliable idle and good transition. Please let me know if you have any ideas. I am getting back into the hobby after a ten year abscence. Thanks everyone. Randy

Many new engines won't run well (or at all) at full throttle until they have been broken in. If the manual says to start at 2.5 turns out then next step in break in will be to lean it out. You should have to open the needle at all. Since you've run the first two tanks already close the needle (gently) and turn it back out 2 1/4 turns and rev it up again. It should get closer to full throttle. I'm not a master with airplane engines yet so I won't give you a full break in procedure. Keep leaning the needle slowly until you can run at full throttle without it 4-cycling but keeping it rich so there is a good trail of smoke coming out of the muffler.

Thanks gubbs3, I'll try that