DescriptionHonda® XL75 1977-1979 Honda® XR75 1973-1978 (Excludes XR75 1973-1976) Honda® XL80S 1980-1985 Honda® XR80 1979-1984 Honda® XR80R 1985-2003 Honda® XL100S 1979-1985 Honda® XR100 1981-1984 Honda® XR100R 1985-2003 Honda® CRF80F 2004-2013 Honda® CRF100F 2004-2013 All 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.TypeExhaustMaterialBlack Diamond™ StainlessCoatingBlack NitronegQuantityPkg. of 1Head Diameter20.50mm / 0.807″Stem Diameter5.4mm / 0.2140″Tulip20ºOverall Length3.100″RemarksStandard