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Finally located the problem, found the "needle jets" to be missing from both carburetors. It appears the last owner did in fact disassemble the carburetors for cleaning and failed to reinstall the jets and gave up on the bike when it would not run correctly. As a result, fuel was flowing past the slide needles and through the main jets constantly, causing a very rich running condition. The problem was right in front of me the whole time.
Part #16017 and circled in red on the attached Kawasaki parts fiche. You can see in the attached pictures as well, there should be brass jets sticking up into the throat of the carburetors.
Replaced the missing parts and the bike is now running properly. Thank you to all those members who provided guidance, I very much appreciate your time and patience!
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