Wossner Forged Piston Kit 66.42mm Bore – Honda CR250R (1986–1996)

This Wossner forged piston kit is designed for Honda CR250R models produced from 1986 to 1996. With a bore size of 66.42 mm and a piston diameter of 66.36 mm (+0.02 mm oversize), it is intended for cylinders that require a minimal oversize to restore proper clearance. The piston’s forged construction enhances strength, while the elliptical design ensures uniform load distribution under heat expansion. Made in Germany for maximum precision and reliability.

Features

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  Forged piston ensures high strength and resistance to deformation

  
  


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  Superior thermal conductivity for efficient combustion heat transfer

  
  


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  Elliptical design distributes pressure evenly and minimises localised wear

  
  


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  Manufactured in Germany to high precision standards

  
  

Specifications

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  Bore Size: 66.42 mm

  
  


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  Piston Diameter: 66.36 mm

  
  


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  Engine Displacement: 249 cm³

  
  


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  Stroke: 72.00 mm

  
  


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  Clearance: 0.06 mm

  
  


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  Compression Height: 38.00 mm

  
  


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  Compression Ratio: 2-stroke (Wossner and OEM)

  
  

Cross-Reference Wossner Part Numbers

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  Piston Kit: 8021DC

  
  


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  Lock: CW18

  
  


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  Pin: WP033

  
  


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  Ring Set: RSB6640 x 2

  
  

Vehicle Fitments

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  1986–1996 Honda CR250