Kibble White Black Diamond Exhaust valveYAMAHA 250 YZ 250 F (CG40) - 2019Ref : KIBW00209A / 09263179

Valve Black Diamond™ by KIBBLEWHITE: a machined exhaust valve for demanding riders. Made from EV8 stainless steel using a one-piece forging process and CNC machined, this valve combines strength with optimised geometry for controlled gas flow. The profile has been studied using finite element analysis (F.E.A.) and validated on a computerised flow bench, ensuring dimensional accuracy and manufacturing consistency.

• Usage: Exhaust valve for motocross bikes
• Material: EV8 stainless steel, one-piece forged
• Surface treatment: German process applied to a depth of 0.002" with a surface layer of 0.0002" — improves wear resistance and reduces friction
• Stem: coated in black Nitroneg for better wear resistance
• Tulip angle: 30°
• Head diameter: 25.00 mm (0.984")
• Manufacturing: United States

Designed for motocross silhouettes such as the YAMAHA YZ 250 F (2019). Intended for builds where reliability and repeatability of engine components matter, this Black Diamond™ valve provides robustness and high-end finish to your cylinder head.

Manufacturer's ref: 80-82316