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How about using a reamer?



Good idea, have yet to try it. If I ever need to make a "43" that's what I would do, as I have yet to find 43's commercially available. A .017" reamer is pretty close to .43mm; I also don't have a drill bit that is close to that size.

FWIW, the aftermarket pilot jets are sold by the metric bore size; that is, a "44" = .44mm bore.

The Keyster aftermarket jets are made in Japan and look every bit as good as Keihin.

I should have the 44's by this weekend...