Four strokes are more... um... advanced. If you ever need to fix it. You looking for a world of trouble. I would recommend an Enya 2 stoke. My reason being that I know a guy in my club who has an Enya 19. He has had it for 47 years. He has crashed this engine in places previously thought impossible to crash (i.e. swamps, ponds, nose first in a pot-hole!) and through all of that it still runs as good as when he bought it.