Swapped the air intake along with the gasket and insulating rubber, just to rule out leaks. No change.
But did notice something new. The bike actually idle ok (a little ragged, but held on) for about 2 minutes, when the engine got warm. That's when she started to want to stall.
At that point, I happened to pull the throttle slide out, and white wispy smoke came out of the top of the carb. It wasn't just one puff, rather it continued for 30 seconds or so.
I then pulled the plug and noticed it already had oil on the node, despite being only a day old.
So definitely seems that I have oil leaking into the cylinder, the question is just whether that is also affecting the idle problem or not.
The replacement intake is the one from Viola that I had painted with engine paint as a test. The insulating gasket is in a lot better shape than the original one.
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