MRP-CONICAL SPRING KIT-GY6 Including retainers and Keepers The MRP Conical Valve spring kit is the most innovative valve spring kit in the industry. Hands down MRP has innovated time and time again while others play catch up to our innovation with the first set of standard race conical GY6 Springs in the USA. The springs are Bee Hive shaped to reduce and eliminate damaging spring harmonics, or spring surge. Valve spring surge is the leading cause of valve float. Valve float can cause catastrophic failure to your four stroke motor. Because each coil of the Conical Spring is a different size, and because the first few coils are closer together the spring cannot harmonize at high RPM’s and cause spring failure. Conical springs weigh one third of a constant wound dual spring while providing more closed pressure than stock components. A light valve train equals high performance in any motor. The kit also comes with lighter retainers and collets further reducing the effective valve mass by over 35% Your motor will rev faster and your valves will last longer with the MRP Conical valve Spring Kit. Less friction and heat are produced extending the life of your head and prolonging the life of your valves. High performance high revving race motors demand the best quality valve train components, the MRP GY6 Conical Valve Spring Kit delivers. MADE IN THE USA This is Honda Clone Gy6 Air Cooled Valve Superior Casting for scooters with 150cc and 125cc GY6 QMI152/157 QMJ152/157 4-stroke engines