This Wossner piston kit with a 77mm bore is a standard replacement for the Kawasaki Z11 (ZX11) models from 1990 to 2001. Forged in Germany for high durability and optimal performance, it is engineered for efficient heat transfer and consistent expansion behaviour under thermal stress. The elliptical piston design distributes pressure evenly, helping to prevent piston collapse during high-load operation.

Features

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  Forged construction for enhanced strength and thermal resilience

  
  


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  Optimised for efficient combustion chamber heat dissipation

  
  


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  Elliptical design provides a consistent bearing surface under heat expansion

  
  


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  Even thrust load distribution minimises localised stress

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore: 77mm (Standard)

  
  


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  Actual bore: 76.95mm

  
  


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  Display volume: 1080 / 1109 cm³

  
  


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  Stroke: 58.00mm

  
  


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  Clearance: 0.06mm

  
  


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  Wossner compression ratio: OEM

  
  


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  OEM compression ratio: 11.00:1

  
  


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  Dome volume: -3.70 cm³

  
  


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  Compression height: 25.00mm

  
  


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  Theoretical weight: 209.00g

  
  


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  Lock Part Number: CW18

  
  


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  Pin Part Number: WP031

  
  


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  Ring Set Part Number: 770XDS

  
  

Cross-Reference OEM Part Numbers

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  56-W9814.77.WO

  
  


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  K8801D100-4

  
  

Vehicle Fitments

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  Kawasaki Z11 (ZX11) (1990–2001)