This Wossner forged piston kit with a 56.75mm bore (56.69mm) is designed for the 1984 Yamaha YZ125. Manufactured in Germany, it delivers improved strength and efficient thermal conductivity. Its elliptical design ensures a more uniform bearing surface under heat expansion, promoting even thrust load distribution and reducing the risk of piston collapse.

Features

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  Forged piston for enhanced strength and durability

  
  


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  Designed for optimal heat transfer from combustion to cylinder walls

  
  


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  Elliptical profile provides uniform pressure distribution under thermal expansion

  
  


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  Made in Germany

  
  

Specifications

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  Bore size: 56.75mm (56.69mm)

  
  


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  Display volume: 123 cm³

  
  


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  Stroke: 50.00 mm

  
  


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  Clearance: 0.06 mm

  
  


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  Compression height: 30.80 mm

  
  


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  Theoretical weight: Not specified

  
  


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  Compression ratio: 2-stroke (Wossner and OEM)

  
  

Cross-Reference OEM Part Numbers

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  Piston: 8120D075

  
  


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  Lock: CW16

  
  


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  Pin: WP036

  
  


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  Ring Set: RSB5675

  
  

Vehicle Fitments

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  Yamaha YZ125 1984