ORIGINAL: buck1856
Last engine i had that looked like that was a crafstman,it was a 31cc,had the carb on bottom.I still have the block and reeds.The one i had was CW rotation.
I just saw one of these at the club meeting last month. It was CW rotation as well. Muffler is held on with springs.
Probably a bit heavy for sport flying. You could convert to EI and use it on a Cub. I imagine you will need a pusher prop since it rotates backwards. Look at the spark coil. There is an arrow indicating direction it spins.