Not to mention having to carry extra fuel thus more weight! I like my fourstrokes better than my two strokes in almost every situation the exception being if I have a plane Im looking for maximun rpms from the engine. I dont fly too many of them anymore. Two strokes do like to rev higher than fourstrokes thus most people like to use smaller props on them. I think its a misconception that a four stroke can pull a bigger prop than a two stroke displacement being equal. I also like the smaller muffler size of a fourstroke, its easier to fit in most planes.