This Wossner forged piston kit is a standard-size replacement specifically designed for Yamaha PW50 models from 1981 to 2019. Crafted in Germany, it offers enhanced durability and precise engineering for small two-stroke engines, ensuring optimal fit and performance.

Features

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  Forged construction for high strength and longevity

  
  


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  Elliptical design provides uniform bearing surface during heat expansion

  
  


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  Facilitates efficient heat transfer to the cylinder walls

  
  


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  Prevents localised pressure buildup and piston collapse

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore Size: 40.00mm

  
  


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  Actual Piston Size: 39.95mm

  
  


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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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  Circlip Part Number: CW10

  
  


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  Pin Part Number: WP105

  
  


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  Ring Set Part Number: RSB4000

  
  

Cross-Reference OEM Part Numbers

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  Part No: 56-W938+000_WO

  
  


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  Cross Reference: 18M-11631-00-A0, 653M04000

  
  

Vehicle Fitments

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  Yamaha PW50 (1981–2019)