I put about 450 hrs on a solid lifter 2200 engine in my Avid Flyer MK IV. Performance in takeoff and climb was very similar to the 582 that was in the plane before the switch. Cruise was about 10-15 MPH faster. I would probably still be flying the plane, but had a oil line that went to the oil cooler burst, and ended up landing in a to short field. I'm rebuilding it now, so it will fly again. It was a nice running engine. 912 Rotax is probably a better match for a Kitfox 4, but the Jabiru in my opinion is better than the Rotax 2 strokes. Jim Chuk