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Ok - Flush the tank again. Sitting for so long you have no idea what's floating around in there.
This all just feels like a fluid flow problem - in the tank, in the lines, and in the carb itself.
A good cleaning doesn't do you any good if it immediately gets clogged back up with junk.
Popping can be fuel delivery, but it can also be a lean mixture - it's what happens when people decelerate after having holes punched in the exhaust, for example. Ensure that there are no vacuum leaks and that the headers are sealed going into the head.
I've used a smoking incense stick to search for leaks before with good results. Get the tip into proper ember form and get your bike into a garage, or anything that blocks wind, if you can.
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