This sled has around 45 hours on the clock and is having great difficulty in restarting once it has ran a few miles. 2 to 3 pulls to get it going in the morning but 12 to 30 pulls to get it restarted. If I wait twenty minutes or so then it starts fine, 2 or 3 pulls. Had it in to the dealer and they replaced the plugs, no difference. It feels like a vapour lock. Does anybody have any ideas?