Engine › TOP END SERVICE KIT YAM TOP END SERVICE KIT YAM $0.00 Sold Out Designed specifically for the performance demands of popular racing MX Bikes and QuadsPistons designed to maintain the stock compression after the effects of the dished stainless valves2618 Alloy Fully CNC Machined Piston with performance skirt coatingBlack Diamondâ„¢ Stainless Steel conversion system significantly increases valve durabilityLightweight Racing Spring Kit compatible with high performance camsAll of the gaskets, rings, pins and seals required for a top end rebuildIncludes Piston, Rings, Clips and PinIncludes Top End Gasket Kit by CometicIncludes KPMI® S.S. Black Diamondâ„¢ Valves, Stock Head Dia.Includes Dual Spring Titanium Retainer Spring Kit, Which Allows for 0.440†In. and Ex. Valve Lift Sold Out Added! Designed specifically for the performance demands of popular racing MX Bikes and QuadsPistons designed to maintain the stock compression after the effects of the dished stainless valves2618 Alloy Fully CNC Machined Piston with performance skirt coatingBlack Diamondâ„¢ Stainless Steel conversion system significantly increases valve durabilityLightweight Racing Spring Kit compatible with high performance camsAll of the gaskets, rings, pins and seals required for a top end rebuildIncludes Piston, Rings, Clips and PinIncludes Top End Gasket Kit by CometicIncludes KPMI® S.S. Black Diamondâ„¢ Valves, Stock Head Dia.Includes Dual Spring Titanium Retainer Spring Kit, Which Allows for 0.440†In. and Ex. Valve Lift