so I got an rn 125 and got the parts it needed to run , motor had good compression and ran pretty well except smoked a lot and it would sputter a lot when I tried to get onto it then it would open up and get into the powerband . Anyway I rode it for about 20 minutes and all of a sudden it felt like the chain popped off and I stopped moving so I left the bike running and got off to check chain and it’s was on and bike was in gear but wasn’t moving so I shut it off and pushed it home and now it has no compression and something is blown up I can hear the metal clacking around , would a piston cause it to stop moving all of a sudden like that ?
