550 Wont restart after running perfect.

Hey guys, new user here. Just curious if anyone else had this issue, My 550sx (w/ js550 motor) Will start right up cold with a little primer use. It would run perfect till it was out of Fuel. Anyway after riding for about 20 minutes it would not start back up right away unless it sat for about an hour and got cold again.. little blast of starting fluid didn't even do it, Could it be getting flooded? This is a new issue as of last season. Any input is appreciated, thanks all.
 
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