The Wossner K8594D375-2 piston kit is a forged piston set designed for Harley Davidson Twin Cam engines, offering enhanced durability and thermal efficiency. With an oversized bore of +3.75mm (3.898") and a flat top design, these pistons are built for high performance under demanding conditions. Manufactured in Germany, the kit includes all necessary components for precise and reliable installation.

Features

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  Forged high-performance pistons with skirt coating

  
  


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  Elliptical design for improved load distribution and thermal expansion control

  
  


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  Superior heat transfer from the 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: 3.898" (+0.148", +3.75mm)

  
  


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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-W9865.375.WO

  
  


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  Ring Set Part No. 990XSY

  
  

Vehicle Fitments

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  Harley Davidson 1453cc Twin Cam 1999–2009

  
  


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  Harley Davidson 1561cc Twin Cam 1999–2009

  
  


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  Twin Cam 88 (88 cu. in.) 1999–2006