125 to 110?

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?

why do you want to do that?

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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