Re: Build it, Break it, Repair it, Restart...
Welcome! Be sure to properly diagnose what caused your top-end damage. If you indeed took the engine COMPLETELY apart, I'm sure you cleaned it out and removed any residue which might cause more cylinder destruction. In my experience, I have lost a few in my learning-process. Upper needle-bearing disintegration was the #1 cause followed by lower needle-bearing failure and a wayward piston-clip (I'd tinkered so much with my upper-end that my clips lost their springiness). Of course, make sure you're using the right premix/air-mix too; I destroyed my very first cylinder via overheating.