This Wossner piston kit set includes four forged pistons with a 72.00mm bore and 71.94mm diameter, offering a +2.5mm oversize fitment. Designed for Kawasaki KZ1000J and KZ1000R models from 1981 to 1983, this high-performance kit increases engine displacement to 1075–1105 cm³ and provides improved compression and thermal efficiency for four-cylinder engines.

Features

• 
  

  Forged construction for exceptional strength and durability

  
  


• 
  

  Engineered for efficient heat transfer from combustion chamber to cylinder walls

  
  


• 
  

  Elliptical design ensures uniform bearing surface during thermal expansion

  
  


• 
  

  Distributes thrust loads evenly to reduce risk of piston collapse

  
  


• 
  

  Manufactured in Germany

  
  


• 
  

  Supplied as a set of 4 pistons, pins, rings, and clips

  
  

Specifications

• 
  

  Bore: 72.00mm

  
  


• 
  

  Diameter: 71.94mm

  
  


• 
  

  Engine Displacement: 1075 / 1105 cm³

  
  


• 
  

  Stroke: 66.00 mm

  
  


• 
  

  Clearance: 0.06 mm

  
  


• 
  

  Compression Ratio (Wossner): 1075 cc = 10.30:1 / 1105 cc = 10.50:1

  
  


• 
  

  Compression Ratio (OEM): 9.20:1

  
  


• 
  

  Dome Volume: 18.80 cm³

  
  


• 
  

  Compression Height: 25.30 mm

  
  


• 
  

  Theoretical Weight: 25.30 g

  
  


• 
  

  Engine Cylinders: 4

  
  


• 
  

  Clips P/N: CW17

  
  


• 
  

  Pin P/N: WP083

  
  


• 
  

  Ring Set P/N: 720XDS

  
  

Cross-Reference OEM Part Numbers

• 
  

  Part No. 56-W9934.250.WO

  
  


• 
  

  Wossner Piston K8796D250-4

  
  

Vehicle Fitments

• 
  

  Kawasaki KZ1000J 1981–1983

  
  


• 
  

  Kawasaki KZ1000R 1981–1983