[Darren69]

i wouldn't rule out carb iceing. It used to happen to both my SS 750 and 900 and on my commute I would regularly have to stop in the same layby in the morning for a ciggie break while the ice melted and this would happen predictably at around the same place on cool damp mornings after an extended run on fast a-roads then slowing down for a village. If I would stop for 10 mins then it would be ok for the rest of the run into town. Symptoms are like running out of fuel and the bike will not idle without throttle so it may not be the exact problem you are seeing and I would occasionally pull the choke on to keep the fuel flowing and the bike running.