We are off the dirt and riding down the pavement yesterday toward Cheyenne doing 70 mph. The bike is fine. It vibrates; The pirelli MT21s vibrate; the Wyoming wind vibrates; it's fine. The group occasionally accelerates to 75. Somewhere between 72 and 75, under acceleration, there is a slight hiccup, a subtle vibration or brief loss of power. The bike does not slow down but continues to miss, vibrate, hiccup. The engine does not sound different, but I can feel that something is not quite right. Back at 70-72 mph the bike runs and accelerates okay. Where do I start? Fuel system? My imagination?