This Wossner piston kit with a 74mm bore is a standard replacement for the Kawasaki GPZ1100 (1981–1982) with a 17mm pin. Forged in Germany for strength and performance, the piston is engineered for efficient heat transfer and uniform load distribution under thermal expansion. Its elliptical design reduces localised stress and helps prevent piston failure in demanding conditions.

Features

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  Forged construction for superior strength and durability

  
  


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  Designed for optimal combustion chamber heat dissipation

  
  


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  Elliptical profile ensures uniform bearing surface under heat expansion

  
  


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  Even thrust load distribution reduces risk of piston collapse

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore: 74mm (Standard)

  
  


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  Actual bore: 73.94mm

  
  


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  Display volume: 1135 / 1166 cm³

  
  


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  Stroke: 66.00mm

  
  


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  Clearance: 0.06mm

  
  


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  Wossner compression ratio: 10.30:1

  
  


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  OEM compression ratio: 18.90:1

  
  


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  Dome volume: +16.50 cm³

  
  


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  Compression height: 25.30mm

  
  


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  Pin diameter: 17mm

  
  


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  Lock Part Number: CW17

  
  


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  Pin Part Number: WP083

  
  


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  Ring Set Part Number: 790XDS

  
  

Cross-Reference OEM Part Numbers

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  56-W9811.74.WO

  
  


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  K8819D150-4

  
  

Vehicle Fitments

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  Kawasaki GPZ1100 (1981–1982)