It was replaced with a Rotax engine which required a new mount, engine, and prop. It wasn't done by us. A local pilot did this for, I heard, increased cross-country range. He donated these excess pieces to our Teen Build program. He knows that our program can make a few dollars go a long way. If you're interested in our program, we are:
www.teenaircraftfactory.org. We're currently working on our 6th airplanes with our 6th group of students.