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Blowby?

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Yes, carbon below the ring is a good indication that you should have done a top end some time ago.

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one a 125?

it looks about on par....if you want to maintain peak power, a top end would be useful. But two strokes always get a build up below the ring, and i think that is in part from the exhaust phase...not blow by

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Yes that looks like blowby but it could be because of the exhaust side, but in my opinion, there is no need to rebuild it if you have 15 hrs on the top end.

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