alright, giving you guys a quick update on this to close this thread once and for all
I finally went to the garage a couple of weeks ago and just got the bike back It was the cilynder that had it. The Guy i bought the bike from put a new piston but not a new cylindertube (or however you call it).
Engine got a Nice clean revision and she's running better than ever now!
Thanks for all the help!
Greets
Peejay