All fixed (for now anyway)!
Removed the carb, float bowl and submerged the carb for about 12 hours in seafoam. It sputtered just a bit on initial restart, some white-ish exhaust for about a minute, then ran nice and smooth from there on out.
When I initially removed the float bowl, the gas in there looked perfectly fresh as did the inside of the bowl. All I can figure is that one of the jets or small orifices was clogged a bit.
Hopefully it keeps running clean from here on out.
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