dan1

So basically I was out a couple weeks ago then the bike started to rev really high and the kill switch wouldn’t work then it just cut out and wouldn’t start again. Kicking it felt like it had lost some compression so I took the head off to find he piston rings were melted and the side of the piston was all scratched. So I ordered a new piston, fitted it then tried to start it, compression is good but it just keeps backfiring when trying to start? Any ideas?