I had a frined who I sold my BME 44. Well he had a minor crash and had to take the engine off the plane, but when he did this he removed the carb to check for trash and when putting the engine back together he put the pulse line on the carb fuel inlet. Choked it would pop but would not run. Switched lines to the proper place and no more problem.

I hope this isn't your problem but it's possible. If I were you I would call BME direct and get their advice. Afterall, we're all just guessing. Go to the horses mouth. They will be more than happy to answer any question you have.