UPON ACCELERATION FROM A STOP, THE 2015 HARLEY DAVIDSON STREET 500 AND 750 (XG500 AND XG750) MODELS LOSE FUEL PRESSURE WHEN THE FUEL TANK IS UNDER APPROXIMATELY 1/2 CAPACITY. THE PROBLEM IS EXACERBATED WHEN ACCELERATING UP HILLS. UPON LOSS OF FUEL PRESSURE, THE MOTORCYCLE VIOLENTLY THRUSTS THE RIDER FORWARD, AND WHEN THE FUEL PRESSURE RECOVERS, THE RIDER IS UNEXPECTEDLY THRUST BACKWARDS, RESULTING IN A POSSIBLE LOSS OF CONTROL OF THE VEHICLE AT BEST. IN MY CASE, MY NECK WAS STRAINED. MULTIPLE CASES ON THIS PROBLEM HAVE BEEN REPORTED TO H-D, AND THEY SAY THEY ARE INVESTIGATING. THERE IS NO SOLUTION YET, HOWEVER. *TR