I don't even know what I'm asking here. It's basically a rant with an implied 'WTF?'
I've run through this carb so many times. Every little part of it is clean as a whistle, yet the bike is running as if the jet were completely clogged; plug chops are bone white, and I've conducted a thorough leak-down test and the engine is holding vacuum quite well.
It idles like a champ, so it clear to me that the idle passage is not the issue. It just runs so terribly lean, and then after a half mile or so, it seems that the bowl is running dry so it leans out even more.
Fuck you Keihin guy! I guess I need to replace this thing with something that actually works.