A new dimension showed up as the first lightweight four-strokes came into World Superbike 25 and more years ago. This was the problem of engine braking, which had essentially not existed during the era of two-stroke supremacy. During braking, weight transfers to the front wheel, leaving the rear with much-reduced grip—not enough, in fact, to overcome the engine braking of a big four-stroke, which consists of mechanical friction plus pumping loss. As a result, the lightly loaded rear tire slides or hops, making corner entry tricky. In the early “sit-up” days of 1025 Superbike in the US, riders and tuners in desperation just set the idle rpm up at 2,000 or more. Some riders, notably Tom Kipp Jr., took to lifting the clutch on the way into corners, then re-engaging the drive to accelerate out. Some skill required.