03 cr250 cylinder

I bought a used cylinder cheap thinking that I would have it repaired , replated etc. the bore looks ok except for a small broken piece at the bottom of the right exhaust port. I thought this was maybe due to an obstruction being at the wrong place at the right time. Then a buddy asked my opinion on his son's 03 ccylinder and there it was again, just like my used cylinder. So then I think about the rattling sound mine has until it warms up and how adjusting the RC valve cables seemed to help this somewhat. So does anyone know or think this is normal wear from the power valve closing or rattling and if so, can this be adjusted, new cables etc or is this normal acceptable wear? When I figure out how to post pictures I will. Thanks

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