This Wossner piston kit is a high-performance forged set specifically engineered for the Yamaha YZF R6 models from 2001 to 2006. Featuring a 67.50mm bore and +2.00mm oversize, it includes four pistons designed to optimise thermal management, durability, and load distribution under high stress. Manufactured in Germany, these pistons maintain OEM compression characteristics while enhancing strength and reliability.

Features

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  Set of 4 forged pistons for Yamaha YZF R6 (2001–2006)

  
  


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  Designed for improved combustion heat transfer to cylinder walls

  
  


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  Elliptical design ensures uniform bearing surface under heat expansion

  
  


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  Prevents localised pressure and piston collapse

  
  


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  Compression ratio remains OEM standard

  
  


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  Made in Germany

  
  

Specifications

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  Bore: 67.50mm (Oversize +2.00mm)

  
  


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  Piston diameter: 67.44mm

  
  


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  Compression height: 21.20mm

  
  


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  Displacement: 600cc

  
  


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  Dome volume: -0.10cm³

  
  


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  Clearance: 0.06mm

  
  


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  Stroke: 44.50mm

  
  


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  Display (cm³): 600 / 617 / 636

  
  


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  OEM Compression ratio: 12.40:1

  
  


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  Wossner compression ratio: OEM

  
  

Cross-Reference OEM Part Numbers

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  Part No: 56-W9904.200.WO

  
  


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  Clip No: CW16

  
  


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  Piston Pin No: WP036

  
  


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  Replacement Ring Set No: 675XKS

  
  

Vehicle Fitments

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  Yamaha YZF R6 2001

  
  


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  Yamaha YZF R6 2002

  
  


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  Yamaha YZF R6 2003

  
  


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  Yamaha YZF R6 2004

  
  


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  Yamaha YZF R6 2005

  
  


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  Yamaha YZF R6 2006