That doesn't show any detonation. Heck its clean as. Like no time on it really.
Ring end gap would be interesting.
4 corner can happen with too tight bore or thrashed when cold.
I'd be sending it to a reputable plater and check ring end gap when you have it back.
So. . Is stihl like a chainsaw oil? I'd be going back to belray or similar.
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'07 EC300 GG
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