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Barrel marks yz250 big bore

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Ive put 4 hours on a full rebuild with hot rods Botton end and Athena big bore top end
I had the pipe off and noticed score marks on the barrel so head is off and the are in mutable spots with 2 that you can feel with your fingernail
What would be causing this I would of thought the barrel would still look time new after only 4 hours of soft ridding with the kids


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