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Wondering if new piston size will be ok for new cylinder?

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I have a 97 yz125. I just purchased a new cylinder from millennium technologys, its the exact same size as oem. I'm wondering if this new pro-x piston i purchased that is 53.96mm will fit ok? I know for sure the piston is standard size and is made by the same company that makes the cast pistons for yamaha. I just want to feel absolutely sure.

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If you're absolutely sure that both are standard size, then you should be fine.

I would take them both to a machinist and have them measured just to make sure.

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