Well I have had both cylinders off and they show equal amounts of wear. I took them to a pal who has a lifetime of skill and still builds, races (and wins!) 2T's at national level. He was happy to give them a thumbs up 👍 and recommend that I put it all back together. Aptec and GT said similar after emailing them...so I am going to take it as a done deal.

Andy: can I ask why you would replace the rings at least?

Regarding rings, I see a D shape in the top ring groove on the piston, which I assume is the mark for aligning the ring gap....should I see similar on the bottom expander ring groove?