Reply To: Piston ring sizing question › Forums › Technical › Two Stroke: Help needed › Piston ring sizing question › Reply To: Piston ring sizing question September 24, 2020 at 5:10 am #13291 Keith WilsonParticipant The piston should have a size marked on it. Usually on the crown. As for parts.zweirad-schubert.de or ost2rad.com God for mz parts to.ring sizes to match piston size I believe.good luck.
