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125 to 110?

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is it possible for me to downsize the topend one my sikk 125cc pit bike to a 110 by keeping the original bottom end and just swapping topends?

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No, the 107 and 125 motors share the same bore, 52.4mm. The difference is the crank, the 107 has a 49.4mm crank, the 125 is pushing 57.5mm. To drop the displacement by changing the top end you'd have to find someone to re-sleeve your cylinder down to a smaller bore.

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