You see the carbon by the top ring only 1 spot on the piston.
The piston skirts are fine. No scarring at all.
Rings look good, no damage.
A circle of carbon at the top of the cylinder except in 1 area. I'm thinking oil??? It matches up with the clean area on the piston dome. However, the piston's clean area is much longer than that clean area on top of the cyl.
As you can see, there is some discoloring going on inside the cyl. It looks worse in the pics, but you cannot feel any scratches, or catch any with a fingernail. FYI the cyl is Nikasil plated.
There are 2 of those discolored areas. 1 at 6 O'clock and the other at 12 O'clock. But remember there are no marks on the piston skirts at all.
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