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Drilling holes in the fins helps with cooling too (as long as you have air)
BUT !
A lot of scooters are horizontal and liquid cooled like Piaggio X9. Seeing as you are in Uk, I guess you can source some, there are lots in France at least round 300 € for a full working engine ...
You can keep the CVT (even if it is not very efficient) and just add chain and gearing to accomodate for the different wheel size.
Ho and some are FI too !
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