I went and bought a Mikuni carb. HSR42 Smoothbore. Have you ever worked on one?They are saying plug the carb in the V.O.E.S. They are saying it's by the horn, but my horn is just a horn, with only electrical plugs, not vaccum. Have you heard of V.O.E.S.? I ended up just plugging it in the same vaccum the stock one did. Right now if I twist the throttle before starting it wil run about 2 seconds and stop. I twist the throttle and start, it will run 2 seconds etc.

 

That is vacuum operated electrical switch. It a small black device with a vacuum line hooked to it as well as a wiring plug. It senses engine vacuum and will advance or retard the timing. Sounds to me like you have the vacuum and fuel lines reversed........