I have an 09 big red 700 muv. When I hook up a jumper box it will crank and run like a champ. The jumper box is putting out 16 volts. As soon as I disconnect the box it sputters and dies. I have had the stator replaced, fuel pump, battery, spark plug, wires, voltage regulator rectifier, fuel pump, injector, fuel lines, and fuel injection control unit. I am baffled and don’t know what else to do. Anyone have any similar problems?