Thanks all.
I've been informed by Henry that -
"That carb is a scale model of a vintage design. I can't remember the manufacturer offhand, but they are seen on many antique engines in the US. The tiny spring underneath is an automatic choke valve that helps guarantee the engine draws fuel on intake strokes. Quite a delicate accomplishment to replicate at this size".@JinMachineJin how you miniaturised the carburettor on the B02 is simply amazing!
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