Finally got back to this one .
Re evaluating the symptoms made me realize the problem is in fact electrical.. One of the condensers was bad. Silly me for not changing both of them when I serviced it. Too cheap i guess.
So now , when I pulled the fuel line off to run the fuel out of it, just when it started to die, it started spitting mix out the hole at the end of the vent tube center of the picture. A couple good shots. Should there be a plug. Don’t see one in my other Sportwin carb ?
Mumbles, as always,you are right. in my paper copy of the parts manual, the previous owner, (Rolly Stoker) penciled that o ring in .