This Wossner piston kit with a 78mm bore is an oversized (+2.00mm) replacement for Kawasaki ZX10R models from 2011 onward. Precision-forged in Germany, it is designed for high-performance engines, delivering superior strength, heat dissipation, and stability under thermal expansion. The elliptical profile ensures even load distribution, reducing stress and preventing piston collapse.

Features

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  Forged construction for enhanced strength and performance

  
  


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  Designed for effective heat transfer from combustion chamber to cylinder walls

  
  


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  Elliptical shape maintains uniform bearing surface under expansion

  
  


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  Even thrust load distribution reduces risk of piston failure

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore: 78mm (+2.00mm Oversize)

  
  


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  Actual bore: 77.94mm

  
  


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  Display volume: 998 cm³

  
  


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  Stroke: 55.00mm

  
  


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  Clearance: 0.06mm

  
  


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  Wossner compression ratio: 13.50:1

  
  


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  OEM compression ratio: 13.00:1

  
  


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  Dome volume: -3.00 cm³

  
  


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  Compression height: 22.70mm

  
  


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  Lock Part Number: CW17

  
  


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  Pin Part Number: WP038

  
  


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  Ring Set Part Number: 780XAS

  
  

Cross-Reference OEM Part Numbers

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  56-W9809.78.WO

  
  


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  K8832D200-4

  
  

Vehicle Fitments

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  Kawasaki ZX10R (2011–Current)