The Wossner K8594D475-2 piston kit is a forged piston set specifically engineered for Harley Davidson Twin Cam engines. Featuring a +4.75mm oversize bore (3.935") and a flat top design, these pistons are built to withstand high thermal and mechanical loads. Manufactured in Germany, the kit includes all necessary installation components, ensuring durability and consistent performance.

Features

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  Forged high-performance pistons with skirt coating

  
  


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  Elliptical design for balanced heat expansion and load distribution

  
  


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  Efficient heat transfer from combustion chamber to cylinder walls

  
  


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  Flat top pistons with 8.5:1 compression ratio

  
  


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  Includes rings, clips, and pins

  
  

Specifications

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  Bore size: 3.935" (+0.187", +4.75mm)

  
  


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  Compression ratio: 8.5:1

  
  


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  Quantity: 2 pistons per kit

  
  


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  Made in Germany

  
  

Cross-Reference OEM Part Numbers

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  Part No. 56-W9865.475.WO

  
  


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  Ring Set Part No. 1000XSY

  
  

Vehicle Fitments

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  Harley Davidson 1453cc Twin Cam 1999–2009

  
  


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  Harley Davidson 1593cc Twin Cam 1999–2009

  
  


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  Twin Cam 88 (88 cu. in.) 1999–2006