This Wossner forged piston kit is a standard-size replacement specifically designed for Yamaha PW80 and BW80 two-stroke models. With a 47mm bore, it ensures excellent durability, fitment, and thermal efficiency for long-lasting engine performance.

Features

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  Forged piston for enhanced strength and wear resistance

  
  


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  Elliptical design ensures a uniform bearing surface under thermal expansion

  
  


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  Maximises heat transfer from 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: 47.00mm

  
  


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  Actual Piston Size: 46.95mm

  
  


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  Stroke: 45.60mm

  
  


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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: 29.50mm

  
  


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  Lock Part Number: CW12

  
  


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  Pin Part Number: WP091

  
  


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  Ring Set Part Number: RSB4700

  
  

Cross-Reference OEM Part Numbers

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  Part No: 8233DA

  
  

Vehicle Fitments

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  Yamaha PW80 (1983–1993)

  
  


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  Yamaha BW80 (1986–1988, 1990)

  
  


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  Yamaha YB/TY/PW80 -3E5-