VALVE SPRING SET CRF450X 05-15, KIBBLEWHITE 30-31050 RACING, LIGHTWEIGHT KIT

This lightweight racing spring kit is engineered for high-performance use in Honda CRF450X models from 2005 to 2017. Designed for a 0.440" valve lift, the kit includes chrome silicon valve springs, titanium retainers, and high-tensile steel lower collars. It provides optimal seat pressure and lift characteristics for both intake and exhaust applications, supporting the demands of high-revving 4-stroke engines.

Features

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  Lightweight chrome silicon racing valve springs

  
  


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  Titanium retainers for reduced valvetrain mass

  
  


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  High-tensile steel lower collars

  
  


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  Engineered for 0.440" valve lift compatibility

  
  


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  Optimised for both intake and exhaust valves

  
  

Specifications

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  Exhaust: 0.440" valve lift, 70 lb seat pressure, 183 lb @ 0.375" lift

  
  


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  Intake: 0.440" valve lift, 40 lb seat pressure, 130 lb @ 0.375" lift

  
  

Cross-Reference OEM Part Numbers

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  Part No. 65-709

  
  

Vehicle Fitments

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  Honda CRF450X 2005–2017