Hi Guys,
Just putting new rings into my RZ and the top ring was solidly jammed into the groove at the front of the piston. The piston is definitely not hitting the head, its seems untouched but at the front of the piston, the top groove is visually smaller than the bottom groove and visually smaller then the same groove at the back of the piston. I have not seen this before except when water got into the engine but not this time. There seems a little bit of a lip on the leading edge of the piston, I can only imagine it is collecting the top edge of the exhaust port on the way up.
My solution would be to take the edge off either the top of the exhaust port or the top of the piston.
Anyone had this happen? Comments?