Kibble White Black Diamond Inlet valveRef : KIBW00089A / 09260123

Valve Black Diamond™ - KIBBLEWHITE (Manufacturer's ref: 80-80073). A competition valve designed for the Enduro and Cross universe, machined to replace or enhance the intake components on 4T machines. American manufacturing, aimed at demanding riders seeking reliability and precise adjustment.

• Construction: forged monobloc from EV8 stainless steel, CNC machined finish for consistent geometry and high mechanical strength.
• Surface treatment: special German process applied at .002 depth with a surface layer of .0002, aimed at reducing friction and increasing wear resistance compared to traditional treatments.
• Validated design: profiles defined by finite element analysis (F.E.A.) and tested on a computerised flow bench to optimise intake flow.
• Dimensional characteristics: tulip angle 25° (outer entry) — head diameter 0.906" (23.00 mm).
• Stem: black nitrided coating to limit wear and ensure controlled sliding in the guide.
• Note: requires the use of the Kibblewhite spring kit (sold separately).

Compatible with many 250 cm³ Yamaha models (e.g. YZ 250F 2009/2013, WR 250F 2013). Ideal for engine rebuilds and preparations where consistency, longevity, and high RPM performance are sought.