The Wossner piston kit 8011D050 features a 54.69mm (+0.50 oversize) bore, tailored for KTM 125cc two-stroke engines produced between 1987 and 1993. This high-performance forged piston is designed to enhance heat dissipation and structural reliability. Its elliptical profile helps ensure even distribution of pressure and thrust loads, reducing the risk of piston distortion under high thermal expansion. The component is precision-engineered in Germany, reflecting consistent build quality and performance reliability.

Features

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  High-strength forged piston construction for enhanced durability

  
  


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  Engineered for efficient combustion heat transfer to the cylinder wall

  
  


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  Elliptical design distributes bearing surface and thrust loads evenly

  
  


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  Made in Germany to high engineering standards

  
  

Specifications

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  Display (cm³): 125

  
  


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  Bore size: 54.69mm (+0.50 oversize)

  
  


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  Stroke (mm): 54.10

  
  


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  Piston-to-wall clearance (mm): 0.06

  
  


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  Compression height (mm): 28.00

  
  


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  Compression ratio: 2-stroke (Wossner and OEM)

  
  

Cross-Reference OEM Part Numbers

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  Wossner Piston: 8011D050

  
  


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  Lock: CW15

  
  


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  Pin: WP032

  
  


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  Ring Set: RSB5475 x 2

  
  


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  Internal Reference Part No.: 56-W627_050.WO

  
  

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