I am about to go eat dinner now, so don't have time to type a lot, but take a look at this thread on Smokstak I know it is talking about a 4000 BFA not a 4000 KY, but the concept is similar https://www.smokstak.com/forum/threa...o-high.120831/
Yes I posted that link, what I described was adjusting the high-speed idle jet. It is there for a reason, to adjust the high-speed fuel without tampering with any idle/governor linkages.
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Rather than mess with the old carb, I bought a non-OEM new one on eBay - $32 shipped! It arrived quickly from a US source, and the install was trivial.
So far, it's fine.
Linear Mode
