PISTON KIT 02-20 YZ85 47.50 B, WOSSNER 8104DB YAMAHA MX

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

• 
  

  Forged construction for superior strength and longevity

  
  


• 
  

  Optimised design for efficient combustion heat transfer to cylinder walls

  
  


• 
  

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

  
  


• 
  

  Made in Germany

  
  

Specifications

• 
  

  Bore: 47.51mm

  
  


• 
  

  Actual Bore: 47.46mm

  
  


• 
  

  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

  
  

Cross-Reference OEM Part Numbers

• 
  

  Not specified

  
  

Vehicle Fitments

• 
  

  Yamaha YZ85 2002 - 2019