HusaPemby, sounds like the symptoms I had. I monkeyed around with the carb as well, sent it to our resident expert Dale Lineaweaver, and it helped but did not fix my stalling issues. It even was ridiculous at times. For instance I could not ride in technical stuff like rocks, I would stall every 10 seconds, and if I fell on the right side, the bike would be a pain to restart. I had to have the idle on high and it did not help of course, as it made the bike hotter.
My SEM was just rewound by Sparks and it started on the second kick, even with a carb that was just cleaned and reinstalled (therefore not primed). Although I did not ride around with the bike yet, I can guarantee you it is running 10 times better, and all I did was running the engine in my garage (I would have gone for a little ride if it was plated).
So get it rewound, it's an order.
Also you might want to rebuild the carb, it's not going to be time wasted, if it was never done.