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05 125 sx piston size

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Yes 54mm, I just redid top end on my 04 and motor should be same. I put a wiesco 54mm top end kit in it with piston etc.

thanks my bike is runs pretty strong but i want to get new rings

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Have you done a compression test on it? If it's under 120 or so than I'd agree new rings will make it alot more fun!

Edited by KGAP1

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