Thanks all. Yep, the carbs are only $30 or so and I might go ahead and just grab another one. But since this was more a chance to teach my son about fixing something yourself vs. trashing something and buying a new one, I wanted to exhaust our options first.
I know we tried a little carb cleaner in the intake early on and it wouldn't spark/sputter but maybe I'll try one more soak with the existing carb and then try that again too tonight. If it doesn't work, I'll just order a new one and swap it out.

Hadn't thought about the kill switch. Didn't touch it on purpose but that doesn't mean we didn't do something on accident.

Side note - anybody have any glove recommendations that don't get eaten up by solvents (carb cleaner). I know many just go bare handed, but I figure for my kid I'll go extra careful, especially when he's young. Ate right through the basic gloves I have in the garage. I'm going to try some of the thicker black nitrile gloves I've got stashed away somewhere.