When I left the last post, the forum was not displaying the text of posts, so I had no way of knowing it was a piece of #$%*! v50.
Anyway, it sounds like you have not really cleaned the carb well enough. See if you can determine if giving it short bursts of choke will keep it running. If so, you allmost certainly have not cleaned out the main jet enough. You may also have a fuel filter in the carb inlet, make sure you get good gas flow into the carb by testing flow with the top off.
You also should figure out why the throttle is sticky and fix it.