This Wossner forged piston kit with a 47.51mm bore (+0.01mm oversize) is designed for Yamaha YZ85 models from 2002 to 2019. Crafted for high-performance two-stroke engines, the piston offers excellent strength, heat management, and reliability. Manufactured in Germany, it features an elliptical design that enhances structural integrity under thermal expansion and mechanical load.

Features

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  Forged construction for superior strength and longevity

  
  


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  Optimised design for efficient combustion heat transfer to cylinder walls

  
  


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  Elliptical profile ensures even bearing surface and minimises risk of piston collapse

  
  


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  Made in Germany

  
  

Specifications

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  Bore: 47.51mm

  
  


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  Actual Bore: 47.46mm

  
  


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  Engine Displacement: 85 cm³

  
  


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  Stroke: 47.80mm

  
  


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  Clearance: 0.05mm

  
  


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  Compression Ratio: 2-stroke (Wossner and OEM)

  
  


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  Compression Height: 26.00mm

  
  


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  Lock Part Number: CW14

  
  


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  Pin Part Number: WP058

  
  


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  Ring Set Part Number: RSB4750

  
  


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  Con Rod Kit Part Number: P2008

  
  

Cross-Reference OEM Part Numbers

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  Not specified

  
  

Vehicle Fitments

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  Yamaha YZ85 2002 - 2019