I have a 2009 ST1300 owned from new. It is now showing 174,000 miles and has, this year, developed an intermittent misfire. It happens after I have spent some time, like more than 30 minutes, in heavy city traffic, stopping at junctions, moving slowly in heavy traffic, sitting at traffic lights, all at idle speed or just a whiff of throttle. I can be sitting at idle and there will be a slight "shake" from the bike and when I go to open the throttle to move off there is a very strong misfire. It feels like the bike is going on to two, three cylinders then back to two then, whoa, all four kick in then it's back to 2 or 3 again. This lasts for "some time", perhaps 3 or 4 miles at town speed and then, mysteriously clears and the bike runs as perfectly as it has since new. I have also discovered that, if I stop and switch the engine off when the misfire starts and leave the bike for 15-20 minutes, it re-starts and runs like nothing has happened. I haven't experienced this other than after city riding, out on the open road at all speeds the bike runs sweetly all day. Because the plugs were coming up to their change mileage I have fitted new ones but it doesn't appear to have improved matters. I am at a loss to think how to attack this problem, mainly because it is not present to order. There is no F1 light showing and, as I say, the bike runs as sweet a a nut otherwise. There does not appear to be any correlation between amount of fuel in the tank and the misfire occuring. There is no popping or banging in the exhaust system during the misfire. Any thoughts?