Racing Reed Valve Assembly Top Performance TPR Black for Minarelli AM, Generic, KSR-Moto, Keeway, Motobi, Ride, CPI, 1E40MA, 1E40MB Engines. Top Performances racing reed block with very large inlet cross section. Rather than the standard 4 valves, this model has 8. Initially the high-performance reed blocks were produced for 2-stroke engines in motocross. The power gained just from this reed block is anything up to approx. 3bhp. And now this technology is available for smaller capacity engines, with performance increase you can feel. A truly top-end product.