This Wossner forged piston kit is a +1.00mm oversize replacement for Yamaha PW50 models from 1981 to 1997. Designed for two-stroke engine rebuilds requiring an increased bore size, it provides exceptional durability and precise thermal expansion characteristics.

Features

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  Forged construction ensures superior strength and wear resistance

  
  


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  Elliptical design delivers a uniform bearing surface under heat expansion

  
  


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  Efficient heat transfer from combustion chamber to cylinder walls

  
  


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  Prevents piston collapse by evenly distributing thrust loads

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore Size: 41.00mm

  
  


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  Actual Piston Size: 40.95mm

  
  


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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: RSB4100

  
  

Cross-Reference OEM Part Numbers

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  Part No: 8267D100

  
  

Vehicle Fitments

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  Yamaha PW50 (1981–1997)