This Wossner forged piston kit features a 76.80mm bore size (76.76mm actual) and is a standard fitment for Honda CRF250R models from 2010 to 2013. Designed with a two-ring configuration and made in Germany, the piston offers superior strength and efficient heat transfer. The elliptical profile ensures even thrust load distribution, minimising wear and risk of collapse under thermal stress.

Features

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  Forged piston construction with two-ring design for enhanced durability

  
  


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  Elliptical shape ensures uniform pressure distribution under heat expansion

  
  


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  Engineered for optimal heat transfer to cylinder walls

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore Size: 76.80mm (actual 76.76mm)

  
  


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  Displacement: 249 cm³

  
  


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  Stroke: 53.80 mm

  
  


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  Clearance: 0.04 mm

  
  


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  Compression Ratio (Wossner): 14.20:1

  
  


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  Compression Ratio (OEM): 13.20:1

  
  


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  Dome Volume: +0.10 cm³

  
  


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  Compression Height: 29.00 mm

  
  


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  Theoretical Weight: 19.50 g

  
  


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  Lock Part Number: CW16

  
  


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  Pin Part Number: WP070

  
  


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  Ring Set Part Number: 768XAS-2

  
  

Cross-Reference OEM Part Numbers

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  13110-KRN-A40

  
  

Vehicle Fitments

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  2010 Honda CRF250R

  
  


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  2011 Honda CRF250R

  
  


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  2012 Honda CRF250R

  
  


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  2013 Honda CRF250R