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1983 Honda vt750 Shadow
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That 40S size is strange. Does it look like they were opened before? Maybe an aftermarket jet as many different companies sell jets with different size markings.The factory Keihin jets have a K which looks like a star pattern.
One manual I have shows this. See if those are your carb numbers
 

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1983 Honda vt750 Shadow
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Those are Keihin jets at least, but I never heard of the 40 with an S designation. Maybe an off road racing type fine tuning increment ???
I would recommend putting in the 42 jets. That way you add a little bit of extra enrichment with the exhaust and you won't have to turn the idle mixture screws out so far.
I had #40 jets in my old 1983 bike with aftermarket pipes and I had the screws out to about 3 1/2 turns. So I got creative and drilled them out with the smallest drill I had and they went from about .016' to .020". I only have the screws out about 1/2 turn now, but I lost 10 MPG. I didn't expect that. So I need to go in and put in #42 pilots. Just a little increase in bore size can really effect flow rate I found out !
This video was an education.
 
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