DescriptionKTM® All RFS ATV Engines 450cc-525cc 2008-2009 KTM® All RFS Dirt Bike Engines 400cc-560cc 2000-2009All KPMI® Black Diamond™ Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface build up of .0002. This Black Diamond™ process improves wear properties, reduces friction, and provides resistance to corrosion and wear that is superior to chrome and nickel electrolysis plating. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench. Black Diamond™ Valves are lightweight, strong, one piece forgings with profiles that provide excellent flow characteristics.Model Year CoverageClick HereTypeExhaustMaterialBlack Diamond™ StainlessCoatingBlack NitronegQuantityPkg. of 1Head Diameter31.00mm / 1.220″Stem Diameter6.0mm / 0.2352″Tulip24ºOverall Length3.815″RemarksStandard or OversizeNoteYou must use KPMI® Spring Kit # 96-96000 when installing Black Diamond valves.Unique Identifier No.FR327789_01GAUS