PISTON KIT 02-04 YZ125 54.00 A, WOSSNER 8072DA YAMAHA MX 5NY-11631-01-D0

This Wossner piston kit features a 54.00mm bore and 53.94mm actual piston diameter, designed for Yamaha YZ125 models from 2002 to 2004. Built with forged construction, it delivers strength, optimal heat transfer, and consistent performance for 2-stroke engines under demanding conditions.

Features

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  Forged piston construction enhances durability and structural integrity

  
  


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  Promotes efficient heat transfer from the combustion chamber to the cylinder walls

  
  


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  Elliptical design ensures uniform bearing surface under thermal expansion

  
  


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  Distributes thrust loads evenly to reduce localised pressure and prevent piston collapse

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore: 54.00mm

  
  


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  Piston Diameter: 53.94mm

  
  


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  Display (cm³): 125

  
  


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  Stroke (mm): 54.50

  
  


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  Clearance (mm): 0.06

  
  


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  Compression Height (mm): 28.00

  
  


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  Wossner Compression Ratio: 2-stroke

  
  


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  OEM Compression Ratio: 2-stroke

  
  

Cross-Reference OEM Part Numbers

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  5NY-11631-01-D0

  
  


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  5NY-11631-01-C0

  
  


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  5NY-11631-01-B0

  
  


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  5NY-11631-01-A0

  
  


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  797M05400

  
  


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  09104787

  
  


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  Ring: 5NY-11611-00-00

  
  


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  Pin: 5UN-11633-00-00

  
  


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  Circlip: 93450-16068-00

  
  

Vehicle Fitments

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  Yamaha YZ125 2002–2004

  
  

Included Components

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  Lock: CW15

  
  


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  Pin: WP032

  
  


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  Ring Set: RSB5400

  
  


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  Rod: P2017

  
  


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  Part Number: 56-W797.A.WO (Piston PN# 8072DA)