The Wossner forged piston kit with a 55 mm bore (54.94 mm actual) is designed for Honda CR125 models from 1985 to 1986. This +1.00 mm oversize piston is crafted for maximum durability and efficient heat transfer. The elliptical design minimises stress points during heat expansion and evenly distributes thrust loads, reducing the risk of piston failure. Manufactured in Germany, it meets high standards of precision and performance.

Features

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  Forged construction provides high strength and heat resistance

  
  


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  Elliptical design ensures uniform bearing surface during expansion

  
  


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  Optimised for efficient combustion heat transfer to cylinder walls

  
  


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  Prevents localised pressure and piston collapse under load

  
  


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  Precision-manufactured in Germany

  
  

Specifications

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  Bore Size: 55 mm (54.94 mm)

  
  


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  Piston Part Number: 8127D100

  
  


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  Lock Part Number: CW14

  
  


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  Pin Part Number: WP025

  
  


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  Ring Set Part Number: RSB5500 x 2

  
  


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  Display (Displacement): 124 cm³

  
  


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  Stroke: 54.00 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: 28.00 mm

  
  

Cross-Reference OEM Part Numbers

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  56-W563+100.WO

  
  

Vehicle Fitments

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  1985 Honda CR125

  
  


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  1986 Honda CR125