I've also learned a valuable lesson about why I need to get that god damned extended fuel screw. So I backed the fuel screw out about 1/2-1/4 of a turn. The bike fired up, with choke, but when I gave it throttle, the engine would sputter and die. Assuming that I had the mixture too rich, I screwed it in about 1/4 turn, put everything back in place, and fired it up again. It's about the same. The idle is still very "chuggy" and dies after about 10 seconds, and now, when I open the throttle any more than 1/3 or 1/2, the engine sputters and dies. I'm assuming that I'm running too rich, but I also know next to nothing about carburetors, so I might be a bad judge here. Does it sound like I'm running too rich?
"The impossible often has a kind of integrity which the merely improbable lacks."