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

This exhaust valve is designed as a direct OEM replacement for Yamaha WR and YZ 250F models from 2001 to 2013. Constructed from Black Diamond™ stainless steel and treated with a proprietary nitriding process, it delivers increased wear resistance, reduced friction, and superior durability under high-performance conditions. KPMI recommends pairing this valve with Kibblewhite® lightweight valve spring kits for optimal performance and longevity.

Features

• Manufactured from one-piece forged Black Diamond™ stainless steel

• Nitrided surface treatment for improved wear resistance and reduced friction

• Designed using Finite Element Analysis and flow bench tested for optimal performance

• Compatible with Kibblewhite® lightweight valve spring kits

Specifications

• Valve Type: Exhaust

• Material: Black Diamond™ Stainless

• Coating: Black Nitroneg

• Quantity: 1

• Head Diameter: 24.50 mm / 0.965"

• Stem Diameter: 4.5 mm / 0.1758"

• Tulip: 25º

• Overall Length: 3.070"

• Remarks: Standard

Cross-Reference OEM Part Numbers

• Kibblewhite 80-80077

• PSYCHIC XU-09519E

• Vertex 8400005-1

• Wiseco VET005

• Yamaha 5NL-12121-10-00

Vehicle Fitments

• Yamaha WR250F (2001–2013)

• Yamaha YZ250F (2001–2013)

• 2003 WR250F - WR250FR VALVE

• 2003 YZ250F - YZ250FR VALVE