Welcome to the EPA world. They are jetted so lean that they barely run at idle. The fact that it runs better with a little choke answers the question. I looked at the carb and don't even see any adjustment possibilities. I guess you learn to live with it or try to find the slow speed jet and take a set of small hobby drills and try to open up the jet a little. Wish I had a better answer.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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