This Wossner forged piston kit with a 47.52mm bore (+0.02mm oversize) is manufactured for Yamaha YZ85 models from 2002 to 2019. Designed for durability and performance in two-stroke applications, it features a precision elliptical profile and is forged in Germany to ensure optimal heat transfer, load balance, and resistance to deformation under thermal expansion.

Features

• 
  

  Forged construction ensures maximum strength and reliability

  
  


• 
  

  Optimised for efficient combustion heat transfer to cylinder walls

  
  


• 
  

  Elliptical design promotes uniform bearing surface and reduces piston collapse risk

  
  


• 
  

  Made in Germany

  
  

Specifications

• 
  

  Bore: 47.52mm

  
  


• 
  

  Actual Bore: 47.47mm

  
  


• 
  

  Engine Displacement: 85 cm³

  
  


• 
  

  Stroke: 47.80mm

  
  


• 
  

  Clearance: 0.05mm

  
  


• 
  

  Compression Ratio: 2-stroke (Wossner and OEM)

  
  


• 
  

  Compression Height: 26.00mm

  
  


• 
  

  Lock Part Number: CW14

  
  


• 
  

  Pin Part Number: WP058

  
  


• 
  

  Ring Set Part Number: RSB4750

  
  


• 
  

  Con Rod Kit Part Number: P2008

  
  

Vehicle Fitments

• 
  

  Yamaha YZ85 2002 - 2019