This Wossner 67.40mm standard bore forged piston kit is designed for use in Kawasaki KX250 models from 1987 to 1989. The piston features a forged construction with an elliptical design to manage heat expansion and load distribution effectively. Built for two-stroke applications, the kit supports efficient combustion heat transfer while maintaining structural reliability under demanding performance conditions. Manufactured in Germany, it includes all essential components for compatibility with the specified engine.

Features

• 
  

  Forged piston for superior strength and durability

  
  


• 
  

  Elliptical design allows for even bearing surface during thermal expansion

  
  


• 
  

  Distributes thrust loads to reduce localised pressure and prevent piston collapse

  
  


• 
  

  Engineered for efficient heat transfer from the combustion chamber to the cylinder walls

  
  


• 
  

  Manufactured in Germany

  
  

Specifications

• 
  

  Bore: 67.40mm

  
  


• 
  

  Actual diameter: 67.34mm

  
  


• 
  

  Displacement: 249 cm³

  
  


• 
  

  Stroke: 70.00mm

  
  


• 
  

  Clearance: 0.06mm

  
  


• 
  

  Compression height: 37.00mm

  
  


• 
  

  Compression ratio: 2-stroke

  
  

Cross-Reference OEM Part Numbers

• 
  

  Piston Kit Part No.: 56-W556+000.WO

  
  


• 
  

  Wossner Piston Kit No.: 8129DA

  
  


• 
  

  Lock: CW18

  
  


• 
  

  Pin: WP033

  
  


• 
  

  Ring Set: RSB6740 x 2

  
  


• 
  

  OEM Reference: 13001-1246

  
  


• 
  

  Additional Reference: 556M06740

  
  

Vehicle Fitments

• 
  

  Kawasaki KX250 1987

  
  


• 
  

  Kawasaki KX250 1988

  
  


• 
  

  Kawasaki KX250 1989