This Wossner piston kit with a 56.00mm bore (+2.00mm oversize) is engineered for Yamaha YZ125 and WR125 models from 1998 to 2001. Built in Germany, the forged piston offers superior mechanical strength, heat resistance, and consistent performance in high-revving two-stroke engines.

Features

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  Forged piston for high durability and strength under load

  
  


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  Efficient heat transfer design enhances engine cooling and reliability

  
  


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  Elliptical shape ensures uniform expansion, minimising stress points and risk of piston failure

  
  


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  Manufactured in Germany to exacting standards

  
  

Specifications

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  Bore size: 56.00 mm

  
  


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  Actual piston size: 55.95 mm

  
  


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  Display (cm³): 125

  
  


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  Stroke (mm): 54.50

  
  


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  Clearance (mm): 0.05

  
  


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  Compression ratio: 2-stroke (Wossner and OEM)

  
  


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  Compression height (mm): 28.00

  
  

Vehicle Fitments

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  1998 Yamaha WR125

  
  


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  1998 Yamaha YZ125 Base

  
  


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  1999 Yamaha WR125

  
  


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  1999 Yamaha YZ125 Base

  
  


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  2000 Yamaha WR125

  
  


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  2000 Yamaha YZ125 Base

  
  


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  2001 Yamaha WR125

  
  


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  2001 Yamaha YZ125 Base

  
  

Included Components

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  Piston: Wossner PN# 8091D200

  
  


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  Lock: PN# CW15

  
  


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  Pin: PN# WP032

  
  


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  Ring Set: PN# RSB5600

  
  


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  Rod: PN# P2019