My dad has this engine on his fishing boat, a 1995 Evenrude 25, and I was looking it over today after cleaning the fuel filter and generally cleaning it up and noticed it does not have any sort of air cleaner or air box on the carb. Is that the way it should be? The inside of the cowling is littered with dead bugs and generally pertty dirty ... I well imagine that is also all being pulled in through the carb. Anyone got a picture or a parts breakdown of what should or shouldn't be on there?