First things first, pulled Ivy's top end after she lost all compression a few days back after running for a few seconds.
Leak test (with gas) was pretty conclusive. Definitely a valve stuck slightly open. Left it all disassembled for now.
Switched to testing Red's LED light when hooked up straight to the battery. Confirmed that while it still flickers slightly at idle, it's almost unnoticeable under throttle. So definitely could work but now just need a handlebar switch.
Messed with moving Red's needle position to address the stumble/running rich issue, but didn't make much difference and realized it wouldn't matter much under throttle.
So did the full swap to the brand new carb (same model) and voila! Stumble completely gone and feels like there's much more power.
But wonder why the old carb gunked up so quickly? Going to order an ultrasonic cleaner and give it a thorough cleanse.
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