This Wossner piston kit is designed for Yamaha YZ80 models from 1985 to 1987, featuring a 48.50 mm bore and an actual piston diameter of 48.45 mm. Manufactured in Germany, the piston is forged for improved strength and thermal efficiency. Its elliptical design ensures a consistent bearing surface under thermal expansion, promoting even distribution of thrust loads and reducing localised pressure to prevent piston collapse.

Features

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  Forged piston for increased strength and durability

  
  


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  Engineered for effective combustion heat transfer

  
  


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  Elliptical design provides uniform load distribution

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore size: 48.50 mm

  
  


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  Actual piston diameter: 48.45 mm

  
  


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  Display (cm³): 82

  
  


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  Stroke: 45.60 mm

  
  


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  Clearance: 0.05 mm

  
  


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  Compression height: 26.80 mm

  
  


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  Wossner compression ratio: 2-stroke

  
  


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  OEM compression ratio: 2-stroke

  
  

Cross-Reference OEM Part Numbers

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  Wossner Piston Part Number: 8186D050

  
  


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  Lock Part Number: CW12

  
  


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  Pin Part Number: WP091

  
  


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  Ring Set Part Number: RSB4850

  
  


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  Alternate Part Number: 56-W520+050.WO

  
  

Vehicle Fitments

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  Yamaha YZ80 1985

  
  


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  Yamaha YZ80 1986

  
  


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  Yamaha YZ80 1987