Valve Black Diamond™ by Kibblewhite — machined exhaust valve for Trail/Adventure, Enduro, and Roadster motorcycles. Made from EV8 stainless steel using a monoblock forging process, this valve combines mechanical strength and precision finishing for demanding cylinder heads. Ideal for maintenance operations or engine rebuilds on off-road machines and classic roadsters.
- Manufacturer reference: 30-3004
- Type: Exhaust Valve
- Material: EV8 stainless steel, monoblock forged
- Tulip angle: 29°
- Head diameter: 1.220 (31.00 mm)
- Stem: Black nitrided coating
- Surface treatment: Special German process (treatment at .002 depth, surface layer of .0002)
- Design & control: CNC machining, profiles validated by finite element analysis (F.E.A.) and computerized flow bench
- Manufacturing: United States
The Black Diamond™ is dedicated to exhaust valves requiring a precise tulip profile for optimised flow and controlled wear. Its nitrided stem and surface treatment provide better abrasion resistance and reduce friction at the guide. Suitable for many applications, including: Honda XR 650 R (RE01) 2007, Honda XR 600 R (PE04) 2000, and Honda GB 500 Clubman (PC16) 1990.
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