I believe that is a 20cc engine. My brother has one I converted for him on a Big Stik. Flies and runs great. We had the prop fly off a few times.... Now he is using pusher props and the prop stays on with the left hand threads just fine.

Note that this only works on an airplane with a "square" firewall; no right thrust.... The pusher prop will want to pull to the right, and the right thrust would make it worse. Tractor props turning counter clockwise pull to the left, so that's why some airplanes are designed with right thrust.

AV8TOR