You know that feeling, when you go for a short shakedown cruise after putting everything back together, and when you stop, you notice a washer on the ground? Is that mine? Was it attached to anything??
Really, everything seems alright, alright. Nothing fell off that I know of, the brakes stop, and the only apparent (very very small) leak is around the tach cable. I already have a new seal, I just wasn't sure if it was really leaking until I ruled out other things.
This was my first time rebuilding brakes, and only the second time bleeding them.
I stuffed some objects (a perforated plate, and a reducer wrapped in fiberglass wedged so they can't come out) in between the muffler and the collector tube, and while it's still loud, I think maybe it's significantly better than before - I noticed that some random cars and bikes with loud exhausts exceeded my threshold of pain at 20 feet or so, and by contrast, mine doesn't while sitting on it - without earplugs. Sounds a little deeper pitched than some other bikes. Also the turn signal beeps and I can hear that over the engine.
The idle screw is very useful; I'm not sure if it's the only thing that needed to be adjusted about the (supposedly rebuilt by PO) carburetor, but after a while it looked like the warmed-up idle was right between 1000 and 1200. I'm hoping that running through a tank of fresh gas will gradually make things run better.