But the K25 carburettor was pretty advanced for its time and for instance had automatic mixture adjustment. I tend to agree with Galway that it is unlikely the later I-16's suffered from neg g cutout, but one would have to be sure.
The K25 was also used with the M62/M63 engines, as was the K63 (AK-25-4DF and AK-63-TK). The technical descriptions of these carburettors, as far as I could find them, made no statement regarding the working principle (float or no float) or about behaviour under negative g.
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OK, thanks SaQSoN.
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