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

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  Manufactured from one-piece forged Black Diamond™ stainless steel

  
  


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  Nitrided surface treatment for improved wear resistance and reduced friction

  
  


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

  
  


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  Compatible with Kibblewhite® lightweight valve spring kits

  
  

Specifications

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  Valve Type: Exhaust

  
  


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  Material: Black Diamond™ Stainless

  
  


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  Coating: Black Nitroneg

  
  


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  Quantity: 1

  
  


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  Head Diameter: 24.50 mm / 0.965"

  
  


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  Stem Diameter: 4.5 mm / 0.1758"

  
  


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  Tulip: 25º

  
  


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  Overall Length: 3.070"

  
  


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  Remarks: Standard

  
  

Cross-Reference OEM Part Numbers

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  Kibblewhite 80-80077

  
  


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  PSYCHIC XU-09519E

  
  


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  Vertex 8400005-1

  
  


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  Wiseco VET005

  
  


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  Yamaha 5NL-12121-10-00

  
  

Vehicle Fitments

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  Yamaha WR250F (2001–2013)

  
  


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  Yamaha YZ250F (2001–2013)

  
  


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  2003 WR250F - WR250FR VALVE

  
  


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  2003 YZ250F - YZ250FR VALVE