The Wossner piston kit 8114DA is a standard-size forged piston with a 55.94mm bore, designed for Yamaha YZ125 two-stroke models from 1990 to 1993. This piston offers robust performance and reliability, utilising a forged construction and elliptical geometry to enhance heat management and reduce localised stress during operation. Manufactured in Germany, it meets the demands of high-performance off-road applications.

Features

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  Forged piston construction for enhanced strength and longevity

  
  


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  Optimised for superior heat transfer from combustion chamber to cylinder wall

  
  


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  Elliptical shape provides even bearing surface under thermal expansion

  
  


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  Precision engineered and manufactured in Germany

  
  

Specifications

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  Display (cm³): 124

  
  


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  Bore size: 55.94mm (standard for 56mm cylinder)

  
  


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  Stroke (mm): 50.70

  
  


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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: 8114DA

  
  


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  Lock: CW16

  
  


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  Pin: WP036

  
  


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  Ring Set: RSB5600 x 2

  
  


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  Internal Reference Part No.: 56-W629+00A.WO

  
  


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  OEM Cross-Reference: 4DB-11631-00-A0

  
  

Vehicle Fitments

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  1990 Yamaha YZ125

  
  


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  1991 Yamaha YZ125

  
  


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  1992 Yamaha YZ125

  
  


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  1993 Yamaha YZ125