The Wossner piston kit 8114DB features a 56.01mm bore (+0.01 oversize), tailored for Yamaha YZ125 two-stroke engines manufactured from 1990 to 1993. Crafted from forged material for increased strength, the piston is engineered to promote efficient heat dissipation and reliability under performance demands. The elliptical design allows uniform expansion under heat, reducing stress points and improving overall piston integrity. Precision-made in Germany, this component is suited for both competition and high-demand recreational use.

Features

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  Forged construction ensures superior strength and long-term durability

  
  


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  Heat-optimised design facilitates effective combustion heat dissipation

  
  


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  Elliptical shape maintains a uniform bearing surface during expansion

  
  


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  Manufactured in Germany for high precision and consistency

  
  

Specifications

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  Display (cm³): 124

  
  


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  Bore size: 56.01mm (+0.01 oversize)

  
  


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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: 8114DB

  
  


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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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  Rod: P2047

  
  


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

  
  

Vehicle Fitments

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  1990 Yamaha YZ 125

  
  


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  1991 Yamaha YZ 125

  
  


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  1992 Yamaha YZ 125

  
  


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  1993 Yamaha YZ 125