This Wossner piston kit is designed for Yamaha YZ80 models from 1985 to 1987, featuring a 49.00 mm bore and an actual piston diameter of 48.95 mm. Forged in Germany, the piston offers high strength and efficient heat dissipation from the combustion chamber to the cylinder walls. Its elliptical design promotes uniform bearing surface under thermal expansion, minimising localised pressure and helping to prevent piston collapse.

Features

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  Forged construction for improved durability

  
  


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  Engineered for effective heat transfer from combustion chamber

  
  


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  Elliptical shape ensures even thrust load distribution

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore size: 49.00 mm

  
  


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  Actual piston diameter: 48.95 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: 8186D100

  
  


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  Lock Part Number: CW12

  
  


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  Pin Part Number: WP091

  
  


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  Ring Set Part Number: RSB4900

  
  


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  Alternate Part Number: 56-W520+100.WO

  
  

Vehicle Fitments

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  Yamaha YZ80 1985

  
  


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  Yamaha YZ80 1986

  
  


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  Yamaha YZ80 1987