Ralphbf.
I have a 21cc echo from a cutivator that is clockwise also. One simple solution is to mount the prop hub on the other shaft. Yes turn it around. The small flywheel should make it easy to mount the engine with standoffs positioned around the flywheel. This is how the Zenoah G23 is setup with the flywheel is in back next to the fire wall. It makes for a cleaner installation in tight cowls also. This is how I am going to do my 21cc echo.

Dave