I had this problem on my way down to Popham the other week. Felt like it was running really rough and cut out a couple of times, once leading into a fairly tight right hander
When I cut out I wouldn't bump start on the move so I just pulled the clutch in, hit the starter button and off it went again. Some of the guys said they could smell fuel when following me.
I put it down to some crap in the fuel as it started just after a re-fill and seemed to clear itself up and was fine all the way home.