Only ran out of fuel once on a bike and that was on one of my old Hondas.Switched to reserve and Nada.Luckily I was close to a mates house and he brought me some fuel.Got the bike started and it was billowing Blue Smoke.It was then he told me he had got it out of his dad's 2-Stroke Lawnmower
Good fun on the ride home with plumes of Blue coming out of the exhaust. Turned out the Reserve Straw had come away inside the tank so there was no reserve :O