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It's not the gas, fuel screen, petcock, pump, tank rust or tubing. Any other air related ideas?

The inside of the carbs look clean enough to eat off of. They have new jets, gas and o-rings.
Can't see any rust in the tank.
The tubing looks ok from the outside and seems very pliant. The bike is always kept inside.
If the air filter was clogged, I can't see it working on the first day 3 times ...

I didn't ride her for over a year and when I finally did try it would barely crank. All the internet wisdom said old gas had gummed up the carbs, so I first tried a pretty superficial cleaning. It did run a bit better, but slowly degraded to its former self. Try #2 involved a full jet kit. It ran ...