Top End Service Kit

KPMI Top End Service Kit Restore peak power and durability with the KPMI Top End Service Kit — engineered for MX bikes and quads that demand race-ready performance and long-lasting components. Key Features High-compression domed pistons machined from 2618 alloy with a performance skirt coating to maintain stock compression even with dished valve faces. Fully CNC machined pistons for precise tolerances, reliable sealing, and improved ring life. Black Diamond™ Stainless Steel Valves — conversion system offering up to double the life of stock titanium valves without loss of performance. Lightweight racing spring kit compatible with high-performance cams to support aggressive valve lift and rpm. Complete top-end rebuild contents: pistons, rings, clips, wrist pins, seals and a premium Cometic top end gasket kit. Includes KPMI® S.S. Black Diamond™ valves at stock head diameter and a dual spring titanium retainer spring kit allowing up to 0.440" intake and exhaust valve lift. Why Choose KPMI KPMI combines race-proven materials and precision machining to deliver components that reduce reciprocating mass while increasing valve durability. The kit is tailored for enthusiasts and race teams seeking reliable power, consistent compression, and extended service intervals. What's in the box: Piston assembly (piston, rings, clips, pin), Cometic top-end gasket kit, Black Diamond™ stainless valves, dual spring titanium retainer spring kit, seals and hardware for a complete top-end rebuild.