PISTON KIT 88-92 YZ80 49.00, WOSSNER 8187D100 YAMAHA MX

The Wossner 8187D100 piston kit is built for Yamaha YZ80 models from 1988 to 1992, featuring a 49.00 mm bore for +1.00 mm oversize applications. This German-made forged piston is engineered for durability and optimal heat dissipation. Its elliptical design allows for an even bearing surface during thermal expansion, minimising localised pressure and helping to prevent piston collapse. The kit includes all critical components required for a complete and precise engine rebuild.

Features

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  Forged piston construction ensures high strength and thermal efficiency

  
  


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  Designed for effective heat transfer from the combustion chamber

  
  


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  Elliptical profile promotes uniform thrust load distribution

  
  


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  Minimises localised pressure and reduces the risk of piston collapse

  
  


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  Precision engineered in Germany

  
  

Specifications

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  Bore Size: 49.00 mm

  
  


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  Actual Bore Diameter: 48.95 mm

  
  


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  Stroke: 45.60 mm

  
  


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  Display Displacement: 82 cm³

  
  


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  Clearance: 0.05 mm

  
  


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  Compression Ratio (Wossner and OEM): 2-stroke

  
  


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  Compression Height: 27.00 mm

  
  

Cross-Reference Wossner Part Numbers

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  Piston Kit: 8187D100

  
  


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  Lock: CW12

  
  


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  Pin: WP091

  
  


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  Ring Set: RSB4900

  
  


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  Part No.: 56-W569+100.WO

  
  

Vehicle Fitments

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  Yamaha YZ80 (1988–1992)