This Wossner piston kit is designed for Honda CR250R and ATAC250 models from 1984 to 1985, featuring a 67.00 mm bore with an actual piston diameter of 66.94 mm. Forged in Germany, the piston is built for strength and thermal efficiency, enabling optimal heat transfer from the combustion chamber to the cylinder walls. Its elliptical shape ensures a uniform bearing surface during thermal expansion, reducing localised stress and helping to prevent piston collapse.

Features

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  Forged piston for increased strength and reliability

  
  


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  Engineered to support effective combustion heat transfer

  
  


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  Elliptical design promotes even thrust load distribution

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore size: 67.00 mm

  
  


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  Actual piston diameter: 66.94 mm

  
  


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  Display (cm³): 246

  
  


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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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  Wossner compression ratio: 2-stroke

  
  


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  OEM compression ratio: 2-stroke

  
  

Cross-Reference OEM Part Numbers

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  Wossner Piston Part Number: 8156D100

  
  


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  Lock Part Number: CW18

  
  


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  Pin Part Number: WP033

  
  


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  Ring Set Part Number: RSB6700 x2

  
  


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  Alternate Part Number: 56-W526.P4.WO

  
  

Vehicle Fitments

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  Honda CR250R 1984

  
  


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  Honda CR250R 1985

  
  


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  Honda ATAC250 1984

  
  


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  Honda ATAC250 1985

  
  


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  Honda ATC250R 1985

  
  


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  Honda ATC250R 1986

  
  


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  Honda TRX250R 1985

  
  


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  Honda TRX250R 1986