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.