PISTON KIT 02-04 YZ125 54.00 B, WOSSNER 8072DB YAMAHA MX

This Wossner piston kit with a 54.01mm bore and 53.95mm actual piston diameter is designed for Yamaha YZ125 models from 2002 to 2004. Forged for strength and reliability, this piston provides excellent thermal efficiency and performance for 2-stroke engines, with a precision oversize specification of +0.01mm.

Features

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  Forged piston construction ensures superior strength and long-term durability

  
  


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  Engineered for optimal heat transfer from combustion chamber to cylinder walls

  
  


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  Elliptical profile promotes uniform bearing surface under thermal expansion

  
  


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  Prevents piston collapse by evenly distributing thrust loads and reducing pressure points

  
  


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  Manufactured in Germany

  
  

Specifications

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  Bore: 54.01mm

  
  


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  Piston Diameter: 53.95mm

  
  


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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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  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.B.WO (Piston PN# 8072DB)