ooh you do have glazing going on. Can you get some pictures of the cylinder wall from three or four angles, so we can see the walls which means the piston should down @ BDC(Bottom Dead Center). It would be better if you could completely disassemble the engine and get pics of all the mating surfaces. I'm sure you have a minor problem. If you work with us here we can figure it out, or you could call CEN just to see what they could do for you.

You engine is not dead, and if you had an air leak that actually made a high pitch, I dont think you cold get it started, Or more clearly, I would very surprised if you could get it started. As you tear the engine down check the crank bearings for free spinning or slop, If you heated the engine up that hot you could have very well damaged the crank bearings, again not a big deal, you can order a new block from the 'Bay for about $25-$50 with new bearings already in place.

Good Luck..