This Wossner 68.75mm (+0.75 oversize) forged piston kit is built for Yamaha YZ250 models from 1983 to 1987. Manufactured in Germany, the piston is forged to deliver superior strength and longevity. Its elliptical design ensures an even bearing surface during thermal expansion, helping to distribute thrust loads uniformly and avoid localised pressure that can lead to piston collapse. It is specifically designed for effective heat dissipation from the combustion chamber to the cylinder walls, making it ideal for demanding two-stroke engine performance.

Features

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  Forged piston for high durability and strength

  
  


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  Elliptical design maintains uniform bearing surface under thermal expansion

  
  


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  Reduces localised stress and evenly distributes thrust loads

  
  


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  Optimised for efficient heat transfer from combustion chamber to cylinder walls

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore: 68.75mm

  
  


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  Actual diameter: 68.69mm

  
  


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  Displacement: 246 cm³

  
  


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  Stroke: 68.00mm

  
  


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  Clearance: 0.06mm

  
  


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  Compression height: 36.00mm

  
  


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  Compression ratio: 2-stroke

  
  

Cross-Reference OEM Part Numbers

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  Piston Kit Part No.: 56-W560+075.WO

  
  


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  Wossner Piston Kit No.: 8133D075

  
  


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  Lock: CW18

  
  


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  Pin: WP033

  
  


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  Ring Set: RSB6875 x2

  
  


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  Rod: P2048 (for 1983–1989 models)

  
  

Vehicle Fitments

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  Yamaha YZ250 1983

  
  


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  Yamaha YZ250 1984

  
  


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  Yamaha YZ250 1985

  
  


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  Yamaha YZ250 1986

  
  


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  Yamaha YZ250 1987