Only with the choke on it starts up after a few kicks but it wont idle and it backfires a bit. After running for about 20 seconds it just dies like the kill switch was pushed. I dont understand why it's not running because I just gave the carb a good cleaning and replaced all the gaskets and O'rings. I even rebuilt the accelerator pump. All the jets are stock sizes, and the needle jet is set to the stock number 4 postition. The piolet screw is set at 2 turns out, but I have messed with different positions several times to try and get it to idle correctly but nothing works. It's getting good spark so I can rule out that part. The air filter is clean and in good shape. I made sure all my conections were tight so I dont think it's a air leak issue. My next move is draining out the gas and putting in new, but other than that can anyone help me????