PISTON KIT 1989 YZ125 56.00, WOSSNER 8131DB YAMAHA MX

Wossner Forged Piston Kit 56.01mm Bore – Yamaha YZ125 1989 (8131DB STD)

This Wossner forged piston kit is designed for the 1989 Yamaha YZ125 and features a 56.01mm bore size (actual 55.95mm). Engineered for 2-stroke performance, it offers superior structural integrity and efficient heat transfer. The piston’s elliptical design promotes uniform thrust load distribution during heat expansion, preventing localised stress and reducing the risk of piston collapse. Made in Germany with high precision for durability and performance.

Features

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  Forged construction for maximum strength and wear resistance

  
  


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  Designed for optimal combustion chamber heat dissipation

  
  


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  Elliptical profile enhances surface uniformity under thermal expansion

  
  


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  Engineered specifically for 2-stroke engines

  
  


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  Made in Germany

  
  

Specifications

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  Bore Size: 56.01mm (Standard)

  
  


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  Actual Bore: 55.95mm

  
  


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  Compression Height: 28.00mm

  
  


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  Clearance: 0.06mm

  
  


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  Stroke: 50.00mm

  
  


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  Displacement: 123 cm³

  
  


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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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  Wossner Piston: 8131DB

  
  


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  Ring Set: RSB5600

  
  


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  Lock: CW16

  
  


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  Pin: WP036

  
  


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  Rod: P2047

  
  


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  Internal Reference: 56-W582+00B.WO

  
  

Vehicle Fitments

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  1989 Yamaha YZ125