This Wossner piston kit features a 66.40mm bore in standard size, designed for KTM SX250 models from 2000 to 2002. Manufactured with forged construction, it delivers exceptional strength and heat management tailored to high-performance 2-stroke engines.

Features

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  Forged piston construction offers superior strength and durability

  
  


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  Optimised for effective heat transfer to the cylinder wall from the combustion chamber

  
  


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  Elliptical design maintains a consistent bearing surface under thermal expansion

  
  


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  Distributes thrust loads evenly to minimise localised stress and prevent piston collapse

  
  


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  Made in Germany with high-precision manufacturing

  
  

Specifications

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  Bore: 66.40 mm

  
  


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  Actual piston size: 66.34 mm

  
  


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  Stroke: 72.00 mm

  
  


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  Display volume: 249 cm³

  
  


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  Clearance: 0.06 mm

  
  


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  Compression ratio: 2-stroke (Wossner and OEM)

  
  


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  Compression height: 38.00 mm

  
  

Cross-Reference OEM Part Numbers

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  Piston Kit: 8090DA

  
  


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  Lock: CW18

  
  


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  Pin: WP033

  
  


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  Ring Set: RSB6640

  
  


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  Part No: 56-W774.A.WO

  
  


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  774M06640

  
  

Vehicle Fitments

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  KTM SX250 2000

  
  


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  KTM SX250 2001

  
  


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  KTM SX250 2002