Top End

The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valvesConversion to Black Diamond? stainless steel valves offers up to twice the life of the stock titanium...

Stainless steel conversion kits include only what's needed to convert your head to the long-life stainless steel Black Diamond? intake valvesExtend the life of the valvetrain and intake components by as much as 4x over the OEM titanium partsInclude...

Stainless steel conversion kit includes only what's needed to convert your head to the long-life stainless steel Black Diamond intake valvesExtends the life of the valvetrain and intake components by as much as 4x over the OEM titanium partsIncludes...

Stainless steel conversion kit includes only what's needed to convert your head to the long-life stainless steel Black Diamond intake valvesExtends the life of the valvetrain and intake components by as much as 4x over the OEM titanium partsIncludes...

All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistanceMade in the U.S.A. Yamaha -- YZ 250 F -- (2014, 2016, 2015, 2017, 2018); Yamaha -- YZ...

All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistanceMade in the U.S.A. Yamaha -- YZ 250 F -- (2015, 2018, 2017, 2014, 2016); Yamaha -- YZ...

Black Diamond? valves are CNC machined from one-piece forgings of EV8 Stainless SteelBlack Diamond? proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wearMade in the U.S.A. Yamaha -- WR 250 F -- (2015,...

Black Diamond? valves are CNC machined from one-piece forgings of EV8 Stainless SteelBlack Diamond? proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wearMade in the U.S.A. Yamaha -- YZ 250 FX -- (2018,...

Black Diamond? valves are CNC machined from one-piece forgings of EV8 Stainless SteelBlack Diamond? proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wearMade in the U.S.A. Yamaha -- YZ 450 F -- (2016,...

Black Diamond? valves are CNC machined from one-piece forgings of EV8 Stainless SteelBlack Diamond? proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wearMade in the U.S.A. Yamaha -- YZ 450 F -- (2016,...

Stainless steel conversion kit includes only what's needed to convert your head to the long-life stainless steel Black Diamond intake valvesExtends the life of the valvetrain and intake components by as much as 4x over the OEM titanium partsIncludes...

All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistanceMade in the U.S.A. Yamaha -- YZ 450 F -- (2012, 2013, 2010, 2011, 2015, 2016, 2018,...