Dark Ring in Cylinder wall

Tracy Meade /
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Hey everyone,

This happens sometimes on my cylinders, Never thought much of it, but figured I would ask what to make of it.

Newish kit, after a few break in rides, gave it about 10 miles worth of WOT then broke it down to check out how she looked.

Temps were topping at about 380-390.

Got this pretty dark ring around the top of the cylinder.

Otherwise cylinder/piston look fine.

Is this normal/fine or trying to tell me something.

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