Wossner Forged Piston Kit 54.19mm Bore – KTM GS125 / MX125 (1987–1993)

This Wossner forged piston kit is designed for KTM GS125 and MX125 models from 1987 to 1993. Featuring a standard bore of 54.19 mm, it is engineered for 2-stroke engines requiring high durability and efficient thermal performance. The forged aluminum construction provides exceptional strength, while the elliptical design ensures a more uniform bearing surface under heat expansion, reducing localized pressure and enhancing piston longevity. Precision-manufactured in Germany.

Features

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  Forged construction for superior strength and wear resistance

  
  


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  Optimised for efficient heat dissipation from combustion chamber to cylinder walls

  
  


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  Elliptical piston profile ensures even load distribution and reduces thrust stress

  
  


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  Manufactured in Germany for consistent quality and precision

  
  

Specifications

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  Bore Size: 54.19 mm

  
  


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  Engine Displacement: 125 cm³

  
  


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  Stroke: 54.10 mm

  
  


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  Clearance: 0.06 mm

  
  


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  Compression Height: 28.00 mm

  
  


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  Compression Ratio: 2-stroke (Wossner and OEM)

  
  

Cross-Reference Wossner Part Numbers

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  Piston Kit: 8011DA

  
  


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  Lock: CW15

  
  


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  Pin: WP032

  
  


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  Ring Set: RSB5425 x 2

  
  

Vehicle Fitments

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  1987 KTM GS 125

  
  


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  1987 KTM MX 125

  
  


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  1988 KTM GS 125

  
  


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  1988 KTM MX 125

  
  


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  1989 KTM GS 125

  
  


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  1989 KTM MX 125

  
  


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  1990 KTM GS 125

  
  


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  1990 KTM MX 125

  
  


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  1991 KTM GS 125

  
  


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  1991 KTM MX 125

  
  


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  1992 KTM GS 125

  
  


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  1992 KTM MX 125

  
  


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  1993 KTM GS 125

  
  


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  1993 KTM MX 125