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Have you tried swapping the oil rings around between the pistons? This will tell you if it's the piston ring gap not having enough depth or if it's the actual rings at fault. The 250RS piston I had a similar issue with was a pattern part from DSS. I can't remember the actual make but it was pattern but not IMD or Cruzinimage. I remember it was in a blue and white box though.
Quote from: Laverda Dave on March 01, 2021, 11:51:42 AMHave you tried swapping the oil rings around between the pistons? This will tell you if it's the piston ring gap not having enough depth or if it's the actual rings at fault. The 250RS piston I had a similar issue with was a pattern part from DSS. I can't remember the actual make but it was pattern but not IMD or Cruzinimage. I remember it was in a blue and white box though.I meant to say ring grove depth not gap! Although interesting to see if the ring gap is larger or smaller if fitted to another piston but in the same bore.
I put one of the Conrods from my other crank on number 4 and it was fine. Took a closer look at the one I took off and... Spot the problem? Well, bugger. (Attachment Link)