Peugeot Elystar 2 stroke 49cc 2005 update.

Took the cylinder of and I saw that the rings have seen some better days. So I decided to replace them. One of the old rings broke when I took it of and a small peace fell in the motor and the motor started to lock up. So I took the entire motor out, pour some gas down the cylinder hole and a lot of shit came out, surprised it was running at all. The ring peace also fell out, so it turns over fine now. Put everything back together. Now she runs but she still doesn't run right. It still sounds like it's missing, but I checked a lot of things and everything seems to be fine. So again I still don't know whats wrong with it.