I'm always leery about rebuilt carbs from big parts venders.(parts stores)I've seen enough of them to turn me off.Seems they have them done by children, as cheap as they can so you get em cheap also.I redo them myself,as then you know when putting them on where the problem is as I know the carb is right.With a parts store rbuild you havent seen inside it so you could have dirt, jammed screws,wrong floathights just to name a few.Tom