This Wossner forged piston kit is a +1.50mm oversize replacement for Yamaha PW50 models from 1981 to 1995. Precision-built in Germany, it is ideal for engines requiring a significant overbore while maintaining durability and performance in small-displacement two-stroke applications.

Features

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  Forged piston construction for enhanced strength and longevity

  
  


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  Elliptical design ensures a consistent bearing surface during heat expansion

  
  


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  Optimised for efficient heat dissipation from the combustion chamber to cylinder walls

  
  


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  Evenly distributes thrust loads to reduce the risk of piston collapse

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore Size: 41.50mm

  
  


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  Actual Piston Size: 41.45mm

  
  


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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: RSB4150

  
  

Cross-Reference OEM Part Numbers

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  Part No: 8267D150

  
  

Vehicle Fitments

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  Yamaha PW50 (1981–1995)