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20003 cr125 regearing

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I just bought a spare cr125 motor for $250. I am going to rebuild it, top and bottom end. Anyone know how to re-gear it for more low end grunt in the second and third gears for trail riding? Any other advise on the rebuild would be helpful.

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run a 53T rear sprocket

You could also swap to a complete 6sp tranny from the 90-97 years if you can find one complete

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