This Wossner forged piston kit features a 57.50mm bore (57.44mm) and is designed for Yamaha YZ125 models from 1983 and 1985. Manufactured in Germany, the piston provides enhanced strength and is engineered for effective heat transfer, even pressure distribution, and prevention of piston collapse under performance conditions.

Features

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  Forged piston construction for increased strength

  
  


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  Designed to optimize heat transfer from combustion chamber to cylinder walls

  
  


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  Elliptical profile ensures uniform bearing surface under thermal expansion

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore size: 57.50mm (57.44mm)

  
  


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  Display volume: 83 cm³

  
  


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  Stroke: 84.00 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: 8119D150

  
  


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  Lock: CW16

  
  


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  Pin: WP036

  
  


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  Ring Set: RSB5750

  
  

Vehicle Fitments

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  Yamaha YZ125 1983

  
  


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  Yamaha YZ125 1985