Carbon scratches, sounds interesting. The two scratches on the cylinder match exactly with two 11 o'clock scratches on the piston (backside of piston in picture).
The compression rings move around in their grooves, but seem to stick if pushed in -- don't know if that's to be expected.
The two sets of oil rings are separated and not in the same groove.
I'm off to Harbor Freight tomorrow to get a feeler gauge and ring compressor, so will know the land clearance tomorrow.
The shiny area in the picture is a drop light shining up through the bottom of the engine.
Thanks for your reply. I'm sure learning a lot. When I first looked at removing the cap bolts, I thought there was no way I could pull this off, but after removing the piston, thought, well, this is kinda fun. The rod bearings were slick and smooth without a hint of damage. Guess the antifreeze, at least, didn't hurt this bearing.
I'm contemplating just putting the piston back without changing rings or sleeve, after finding out the cost for both from IH ($250), and listening to another poster.
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