Help identify moby top end

Does anyone recognize the top end on this Motobecane? I know at least the head is not stock

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Re: Help identify moby top end

Pic of bike for fun, just picked up as a non-runner and can’t wait to get it running again. So far has fuel and compression, waiting on new cam and points from treats, hoping that’ll get it to fire and idle

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Re: Help identify moby top end

that is a 47mm Polini head, the cylinder says Airsal, so with that head its likely the 47mm/74cc Airsal, you could probably make that head work on the 45mm/70 Airsal, but its likely the 74

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