The Wossner K8595D375-2 piston kit is a forged, high-performance solution for Harley Davidson Twin Cam engines. Featuring a +3.75mm oversize bore (3.898") and a domed piston design, this kit delivers a 10:1 compression ratio for increased engine output and efficiency. Manufactured in Germany, it comes complete with essential installation components for dependable operation.

Features

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  Forged high-performance pistons with skirt coating

  
  


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  Elliptical design provides consistent thermal expansion and even load distribution

  
  


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  Optimised combustion chamber heat transfer to cylinder walls

  
  


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  Domed pistons with 10:1 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: 10:1

  
  


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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-W9866.375.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