VALVE EXHAUST YZF250 01-13, 5NL-12121-10-00, 80-80077

Kibblewhite Black Diamond Exhaust Valve for Yamaha WR/YZ 250F

Upgrade your Yamaha WR250F or YZ250F engine with this high-performance Black Diamond™ exhaust valve. Engineered as a direct OEM replacement, this valve is constructed from a single piece of forged Black Diamond™ stainless steel and subjected to a proprietary nitriding process. This advanced treatment significantly enhances wear resistance, reduces friction, and provides exceptional durability, even under demanding operating conditions.

Designed using sophisticated Finite Element Analysis and validated through flow bench testing, this exhaust valve ensures optimal engine performance and longevity. For the best results and extended service life, KPMI recommends pairing this valve with Kibblewhite® lightweight valve spring kits.

Key Features:

• Crafted from one-piece forged Black Diamond™ stainless steel for superior strength.
• Features a Black Nitroneg surface treatment for increased wear resistance and reduced friction.
• Engineered using Finite Element Analysis and flow bench tested for peak performance.
• Designed for compatibility with Kibblewhite® lightweight valve spring kits.

Specifications:

• Valve Type: Exhaust
• Material: Black Diamond™ Stainless Steel
• Coating: Black Nitroneg
• Quantity: 1
• Head Diameter: 24.50 mm / 0.965 inches
• Stem Diameter: 4.5 mm / 0.1758 inches
• Tulip Angle: 25 degrees
• Overall Length: 3.070 inches
• Remarks: Standard

Cross-Reference Part Numbers:

• Kibblewhite: 80-80077
• Yamaha: 5NL-12121-10-00
• PSYCHIC: XU-09519E
• Vertex: 8400005-1
• Wiseco: VET005