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Since you're having a low-rpm problem, try riding the bike with some (1/4-1/2) choke applied.
If that makes the symptom go away then your carburetor pilot jets need cleaning.
The newer gasoline blends are designed for fuel injection systems (not carburetors) and seem to have a lot more waxy material in them -- probably a lubricant for the fuel pump and injectors.
Jim
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