Check the vent hose for the gas tank, cut the end at a angle. If water drops get in the end it with not vent and fuel will not flow to the carbs correctly. Once the engine stops the pressure will equalize and then it will start again.
Opening the gas cap slightly will fix it while you are on the road.


05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter