This Wossner forged piston kit features a 76.82mm bore size (76.78mm actual), offering a +0.02mm oversize fitment for Honda CRF250R models from 2010 to 2013. Built with a two-ring configuration and made in Germany, this piston delivers high thermal efficiency and structural integrity. The elliptical design ensures even thrust load distribution, reducing localised stress and enhancing performance.

Features

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  Forged construction with two-ring setup for strength and reliability

  
  


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  Elliptical design maintains even pressure distribution under heat

  
  


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  Optimised for superior heat transfer from combustion chamber to cylinder walls

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore Size: 76.82mm (actual 76.78mm)

  
  


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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

  
  

Cross-Reference OEM Part Numbers

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  56-W950.C.WO

  
  

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