I that you carb sticking out of the cowl? I read an article a while ago, so I don't remember it clearly, but I thought I remembered something about a bit of noise coming from the carb. Since it doesn't fit in the cowl, you might try puting an air filter on it. I have never tired this, so I have no idea if it will reduce the db, or if it does by how much. Maybe someone else has more info on this.