Just because you've cleaned and tested something doesn't mean you should necessarily cross it off your list.
Any chance of getting another carb off another bike and trying it out ?
Cold engines and hot engines have VERY different fuel/air requirements.
It could be running very rich and at high temperatures, trips it up.
How is the choke and pilot curcuit ?? Do you need choke to start it ??
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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