I have this engine and it seems like there is a major problem with it. The engine is new and has run about 15-20 minutes on the bench. The problem is it wont stay running for more than 30-45 seconds now. The first few times it ran was the only time it ran at all. I have opened up the carb and cleaned it up and all seems fine. Each time I start now, I choke it and it starts. Runs for say 45 sec. and dies. Next time I have to choke again. It wont start otherwise. The throttle is set at idle and trim full OPEN. This is basically high idle. I dont even touch the throttle stick and still the engine dies. The needles are set at factory settings of 1.5 turns from close. I have tweaked them as well, but still it dies. It seems like the carb isnt sucking fuel properly. I have tried to run it with an external tank held above the engine eliminating any gravity issue. Although I know walbro carbs dont need all this, I still tried it. No difference. Could it be a faulty carb??? Its a brand new engine? What can be wrong with the carb?

I am sure I am missing something here. I have had it with this engine . Any advice would be appreciated.