The Zenith carburetor 14257 was designed for the gasoline version of the TM (totally metric) engines. 
As of 12/2025, Zenith has ceased production .This is the carburetor style that should have been installed on the SA200. Note, it has an accelerator pump built in; when you strike an arc, the engine doesn't hesitate. You may see these on the net. If you find a new one on order, it! Zenith has ceased production. For normal welder application the electric solenoid is unnecessary. Nobody can tell me why it was added. If I were to guess it'sw there if you wan to run the engine on LP, just a guess.