This Wossner piston kit features a 66.00 mm bore with an actual piston diameter of 65.94 mm and is designed for Honda CR250R and ATAC250 models from 1984 to 1985. Forged in Germany, the piston is built for durability and effective heat transfer from the combustion chamber to the cylinder walls. Its elliptical design ensures even load distribution during thermal expansion, reducing localised stress and preventing piston collapse.

Features

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  Forged piston for enhanced structural integrity

  
  


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  Designed for efficient combustion heat transfer

  
  


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  Elliptical shape promotes uniform thrust load distribution

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore size: 66.00 mm

  
  


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  Actual piston diameter: 65.94 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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  13100-KA4-740

  
  


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  526M06600

  
  


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  Wossner Piston Part Number: 8156DA

  
  


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  Lock Part Number: CW18

  
  


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  Pin Part Number: WP033

  
  


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  Ring Set Part Number: RSB6600 x2

  
  


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  Alternate Part Number: 56-W526.P0.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