We ended up cooking over 40 breakfasts before putting everything away. I then went and changed the spark plugs and cleaned the air filter, before taking it out for an hour or so of pottering around. There was a guy in a Piper Cub and we flew around each other for a while.
On the way home, I picked up the parts to replace the bad valve, and when I got home I swapped that in. It takes a couple of hours for the glue to dry, but when I turned the water back on, the new valve body leaks at the top, so I get to cut that back out and do it all again.