MotoGP-derived Assist Slipper Clutch helps to ensure confident downshifting and deceleration as well as quick re-engagement.The cylinder head on the CBR1000RR SPs 16-valve DOUBLE OVERHEAD CAMSHAFT engine features polished inlet and exhaust ports and gas-flowed combustion chambers to improve efficiency. Gas-flowing (flow-testing on an air-flow bench) improves both the quality and quantity of airflow at high rpm when air resistance becomes much greater, thereby increasing combustion efficiency and outright power. The valve seats have been matched to the cylinder head and the intake funnels are slash cut, a design pre-owned in World Superbike. The MotoGP-derived Assist Slipper Clutch helps to ensure confident downshifting and deceleration as well as quick clutch re-engagement and light lever action. This clutch design not only provides slip in off-throttle conditions, but also positive lock under power. Uncompromising sport performance.