My daughters electricity went out they borrowed a small generator powered by a b/s engine. Sorry I don't know the size engine but I think that's no matter. The ONLY way it will run is if the choke is completely closed. Any movement toward the open position will shut the engine down. I know the air is coming from somewhere else but where to start? Any help will be greatly appreciated! Oh by the way the unit looks brand new. I'm not sure it's been used and if it has it's very. very, little.