This Wossner piston kit is specifically designed for Honda CR250R models from 2005 to 2007, offering a 68.50mm bore with a 68.44mm specification for performance-oriented engine builds. Forged in Germany, it provides exceptional strength and heat dissipation, making it ideal for high-demand two-stroke applications.

Features

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  German-forged piston for enhanced strength and longevity

  
  


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  Optimised combustion chamber heat transfer to cylinder walls

  
  


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  Elliptical piston shape ensures uniform bearing surface during thermal expansion

  
  


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  Reduces localised pressure and distributes thrust loads evenly to prevent collapse

  
  


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  Tailored for Honda CR250R two-stroke engines

  
  

Specifications

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  Bore: 68.50 mm

  
  


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  Display (Displacement): 249 cm³

  
  


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  Stroke: 72.00 mm

  
  


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  Clearance: 0.06 mm

  
  


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  Compression Ratio (Wossner & OEM): 2-stroke

  
  


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  Compression Height: 38.00 mm

  
  

Cross-Reference OEM Part Numbers

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  Piston Kit: 8171D210

  
  


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  Lock: CW18

  
  


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  Pin: WP033

  
  


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  Ring Set: RDB6850

  
  


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  Rod: P2020

  
  


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  Internal Part No.: 56-W860+210.WO

  
  

Vehicle Fitments

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  2005 Honda CR250R

  
  


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  2006 Honda CR250R

  
  


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  2007 Honda CR250R