Wow. That is extraordinarily educational. Thank you so much. I think I get it now. I can see it working. At first I thought only air passed through those tubes, but no there's fuel in some and air in the other. Got it.
Yes it appears I have fallen completely into the pot of moped stew. I did not see it coming this morning but I just bought a Testi Comfort 50 in Vermont. Turns over but no spark. Under 300 miles on the odometer. I can't wait to dive into that but it will have to wait. I have the NU 50 on the work table right now. And I think there's a Moby 50V in the shed which will be next on deck. That whole pivoting motor thing is hysterical. Can't wait for that one either.
Again, thank you all tremendously for taking the time to share your knowledge and experience with me. It is appreciated.