This Wossner forged high-compression piston kit features a 78.02mm bore size (77.98mm actual), providing a +0.02mm oversize fitment for KTM SX-F250 models from 2013 to 2015. Engineered in Germany with a two-ring design, the piston incorporates an elliptical profile to ensure even load distribution and superior heat transfer. The high-compression dome enhances combustion efficiency for demanding performance conditions.

Features

• 
  

  Forged high-compression piston with two-ring configuration

  
  


• 
  

  Elliptical design ensures uniform pressure distribution during heat expansion

  
  


• 
  

  Optimised for efficient combustion heat transfer to cylinder walls

  
  


• 
  

  Manufactured in Germany

  
  

Specifications

• 
  

  Bore Size: 78.02mm (actual 77.98mm)

  
  


• 
  

  Displacement: 249 cm³

  
  


• 
  

  Stroke: 60.80 mm

  
  


• 
  

  Clearance: 0.05 mm

  
  


• 
  

  Compression Ratio (Wossner): OEM

  
  


• 
  

  Compression Ratio (OEM): 12.60:1

  
  


• 
  

  Dome Volume: +1.00 cm³

  
  


• 
  

  Compression Height: 22.80 mm

  
  


• 
  

  Lock Part Number: CW16

  
  


• 
  

  Pin Part Number: WP070

  
  


• 
  

  Ring Set Part Number: RIK78.00

  
  

Cross-Reference OEM Part Numbers

• 
  

  56-W955.C.WO.HC

  
  

Vehicle Fitments

• 
  

  2013 KTM SX-F250

  
  


• 
  

  2014 KTM SX-F250

  
  


• 
  

  2015 KTM SX-F250