Wossner piston kit 8011DC features a 54.21mm (+0.02 oversize) bore, designed for KTM 125cc two-stroke engines from 1987 to 1993. Built with high-performance applications in mind, this forged piston provides enhanced heat management and mechanical strength. The elliptical piston shape supports even expansion during operation, helping to avoid localised pressure points and structural failures. Precision-made in Germany, it is suitable for both GS and MX models across the listed production years.

Features

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  Forged construction enhances durability and mechanical integrity

  
  


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  Heat-optimised design ensures efficient thermal transfer to cylinder walls

  
  


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  Elliptical geometry promotes uniform surface bearing under expansion

  
  


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  Manufactured in Germany with precision engineering standards

  
  

Specifications

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  Display (cm³): 125

  
  


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  Bore size: 54.21mm (+0.02 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: 8011DC

  
  


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  Lock: CW15

  
  


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  Pin: WP032

  
  


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  Ring Set: RSB5425 x 2

  
  


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  Internal Reference Part No.: 56-W627.00C.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