Those stupid Facebook bike forums. You ask a reasonable question and you end up with problems. My mate went on a group for bike enthusiasts earlier and asked if any of them could suggest why his bike is sometimes a bit difficult to start and then misfires occasionally? TWO, not one,but TWO of them came back almost instantly with identical replies - "Crap in your fuel tank." .....so he did, and the damned thing won't start at all now..