This Wossner piston kit is designed for Yamaha YZ80 models from 1985 to 1987, featuring a 50.00 mm bore with an actual piston diameter of 49.95 mm. Manufactured in Germany, the forged piston delivers high strength and efficient heat transfer from the combustion chamber to the cylinder walls. The elliptical design ensures uniform bearing surface under heat expansion, minimizing localized stress and reducing the risk of piston failure.

Features

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  Forged piston construction for durability under high stress

  
  


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  Designed for optimal combustion heat transfer

  
  


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  Elliptical profile ensures even thrust load distribution

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore size: 50.00 mm

  
  


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  Actual piston diameter: 49.95 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: 8186D200

  
  


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  Lock Part Number: CW12

  
  


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  Pin Part Number: WP091

  
  


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  Ring Set Part Number: RSB5000

  
  


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  Alternate Part Number: 56-W520+200.WO

  
  

Vehicle Fitments

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  Yamaha YZ80 1985

  
  


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  Yamaha YZ80 1986

  
  


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  Yamaha YZ80 1987