Ivy: Speedo Fix but Engine Dies

Went down for an early morning session to look at Ivy's speedo again.  Once I had the old gear out and was looking at it, it was painfully obvious that the tabs that are supposed to hold it in place on the hub were bent way out.  No wonder it would work intermittently then stop entirely.  A good lesson in taking time to investigate parts more closely once they're disassembled.

Went for a ride later that day and lo and behold - odo is ticking over nicely!  Speedo is working, too, though it's way off.  It reads at 50mph when I'm doing an actual 30mph. 

But if it's not one thing it's another.  During the ride, I felt the engine starting to bog, then eventually it just quit.  My first thought was battery so I swapped that.  It started up and I rode for a bit more, but then same thing happened again. 

Each time, it would restart after sitting for a bit, but wouldn't last long before dying again.

Made it home after a series of pit stops, but just barely.

I thought it was overheating as it was a slightly warm day (60 degrees) so later in the garage, I switched the needle to the second highest notch (it had been in the middle).

Air screw at 1 1/4 out.