The Wossner Forged Piston Kit (8957DB) with a +0.01mm oversize 77.01mm bore is designed for the Yamaha YZ250F (2019). Manufactured in Germany, this high-performance piston is forged for superior strength and optimised thermal efficiency. Its elliptical skirt design ensures balanced expansion and thrust load distribution, helping to prevent localised stress and piston collapse under high-performance conditions.

Features

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  Forged construction for maximum strength and reliability

  
  


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  Designed for efficient heat transfer from combustion to cylinder walls

  
  


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  Elliptical profile provides uniform bearing surface and load distribution

  
  


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  Manufactured in Germany

  
  

Specifications

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  Piston Size: 77.01mm (+0.01mm Oversize)

  
  


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  Kit Part Number: 56-W8812.B.WO

  
  


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  Wossner Part Number: 8957DB

  
  


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  Piston Type: Forged

  
  

Vehicle Fitments

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  Yamaha YZ250F (2019)