I've already heard several Kitfox pilots that don't care for the Rotax style 2-stroke engines. I'm talking more about the TBO time and the lack of long-term reliability, not additional horsepower.

Is it possible to fit a 4-stroke engine on a already built Kitfox with a Rotax? How much does this cost and what type of engines do people prefer?

Most used Kitfox have the Rotax 582 it would seem, but I'm not sure from the stories I've heard I would be interested in keeping such a engine.

Thanks for the replies & discussion!