This Wossner forged piston kit is a +0.50mm oversize replacement for Yamaha PW50 models from 1981 to 1997. Engineered with precision and manufactured in Germany, it provides enhanced strength and consistent performance for two-stroke engine applications requiring a slightly larger bore size.

Features

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  Forged piston construction for superior strength and durability

  
  


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  Elliptical design ensures a consistent bearing surface during heat expansion

  
  


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  Promotes efficient heat dissipation to cylinder walls

  
  


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  Prevents localised stress and piston collapse

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore Size: 40.50mm

  
  


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  Actual Piston Size: 40.45mm

  
  


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  Stroke: 39.20mm

  
  


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  Piston Clearance: 0.05mm

  
  


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  Wossner Compression Ratio: 2-stroke

  
  


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  OEM Compression Ratio: 2-stroke

  
  


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  Compression Height: 24.90mm

  
  


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  Lock Part Number: CW10

  
  


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  Pin Part Number: WP105

  
  


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  Ring Set Part Number: RSB4050

  
  

Cross-Reference OEM Part Numbers

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  Part No: 8267D050

  
  

Vehicle Fitments

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  Yamaha PW50 (1981–1997)