Dude, that sucks... Ok, to try and further rule out air/fuel before you drop $$ on a stator...
Verify that that the gas cap itself is venting, and the gas cap tube is not clogged. I know this
sounds dumb, and I'm not being insulting, but be sure the gas is on, if it is, try to verify the
petcock is 100% operational, be sure that the gas line from the tank is not bent or kinked, also
be sure where it goes from the (T) to the left and right carbs are not pushed down to far on to
where it goes on the carbs as to cause to great a bend or kink in the line. If all this checks out
try to verify the screen filter in the tank in not blocked. The fact that the bike runs for 3 minutes
does not sound like a timing issue to me. Maybe it is the stator? There really is no way to tell
unless you try swapping it. You will either have a bunch of spare parts or maybe you can sell
them... I got nothin else that makes any sense for you to try. Good luck, and please let us
know what it ends up being...