Kibble White Black Diamond Inlet valveRef : KIBW00090A / 09260124

Valve Black Diamond™ by Kibblewhite — premium intake valve designed for enduro and motocross. CNC machined from a monobloc forging in EV8 stainless steel, it combines strength and optimised geometry for controlled flow in the manifold. Each piece is validated by finite element analysis (F.E.A.) and tested on a computerised flow bench to ensure consistency of profiles.

• Type: Central intake
• Tulip angle: 25°
• Head diameter: 23.00 mm (0.906")
• Stem: black Nitroneg coated
• Surface treatment: German process applied to 0.002 depth with a surface layer of 0.0002, enhancing wear resistance and reducing friction
• Manufacturing: United States

The monobloc design and studied profile are suitable for the demanding cylinder heads of motocross and enduro machines, while facilitating consistent operation and longevity. Note: installation requires the use of the appropriate Kibblewhite spring kit — ensure the correct distribution hardware is available when refurbishing the cylinder head.

Manufacturer reference: 80-80075. Compatible with many 250 cc models (e.g. Yamaha YZ/WR 250 F depending on configurations), please consult your motorcycle specification for confirmation of fitment before installation.