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There was about a 5mm section of the ring missing. The locating pin was still in place, however.
I’m trying to figure out if the damage came from the hunk of piston/ring that departed, or maybe debris from elsewhere. The big end seems all there, and I do run an airbox and filter.
I’ve read a few reports of coolant getting into the cylinder and thermally shocking the piston and leading to a crack, but i didn’t see any signs of where coolant might come through.