This Wossner piston kit features a 48.00 mm bore with a 47.95 mm actual piston diameter and is intended for Yamaha YZ80 models from 1985 to 1987. Forged in Germany, this piston is designed for durability and thermal efficiency, facilitating effective heat transfer from the combustion chamber to the cylinder walls. Its elliptical shape ensures uniform load distribution under thermal expansion, minimising localised stress and reducing the risk of piston failure.

Features

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  Forged piston for enhanced strength and longevity

  
  


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  Designed to improve heat transfer from combustion chamber

  
  


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  Elliptical design aids in even thrust load distribution

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore size: 48.00 mm

  
  


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  Actual piston diameter: 47.95 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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  58T-11631-01-94

  
  


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  520M04800

  
  


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  Wossner Piston Part Number: 8186DA

  
  


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  Lock Part Number: CW12

  
  


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  Pin Part Number: WP091

  
  


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  Ring Set Part Number: RSB4800

  
  


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  Alternate Part Number: 56-W520+000.WO

  
  

Vehicle Fitments

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  Yamaha YZ80 1985

  
  


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  Yamaha YZ80 1986

  
  


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  Yamaha YZ80 1987