Wossner Forged Piston Kit 66.41mm Bore – Honda CR250R (1986–1996)

This Wossner forged piston kit is engineered for Honda CR250R models from 1986 to 1996. With a bore size of 66.41 mm and a piston diameter of 66.35 mm (+0.01 mm oversize), it is designed for use in cylinders requiring a minor oversize piston. The forged construction enhances strength and thermal efficiency, while the elliptical shape ensures even load distribution and reduces the risk of piston collapse. Manufactured in Germany to exacting standards.

Features

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  Forged piston for superior mechanical strength and longevity

  
  


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  Designed to facilitate optimal combustion heat transfer to the cylinder walls

  
  


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  Elliptical geometry ensures uniform pressure distribution and reduces wear

  
  


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  Precision-manufactured in Germany for consistent fit and function

  
  

Specifications

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  Bore Size: 66.41 mm

  
  


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  Piston Diameter: 66.35 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: 8021DB

  
  


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  Lock: CW18

  
  


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  Pin: WP033

  
  


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  Ring Set: RSB6640 x 2

  
  


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  Rod: P2021

  
  

Vehicle Fitments

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  1986 Honda CR250R

  
  


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  1987 Honda CR250R

  
  


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  1988 Honda CR250R

  
  


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  1989 Honda CR250R

  
  


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  1990 Honda CR250R

  
  


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  1991 Honda CR250R

  
  


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  1992 Honda CR250R

  
  


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  1993 Honda CR250R

  
  


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  1994 Honda CR250R

  
  


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  1995 Honda CR250R

  
  


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  1996 Honda CR250R