This Wossner forged piston kit with a 64.25mm bore (64.19mm) is designed for select Yamaha two-stroke models. Engineered in Germany, it provides structural strength, efficient heat dissipation, and even pressure distribution to reduce the risk of piston deformation. Its elliptical shape enhances load balance during thermal expansion, ensuring reliable performance under demanding conditions.

Features

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  Forged piston construction for superior durability

  
  


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  Optimized for effective combustion heat dissipation

  
  


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  Elliptical design for even thrust load distribution under thermal expansion

  
  


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  Made in Germany

  
  

Specifications

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  Bore size: 64.25mm (64.19mm)

  
  


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  Display volume: 347 cm³

  
  


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  Stroke: 54.00 mm

  
  


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  Clearance: 0.06 mm

  
  


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  Compression height: 36.00 mm

  
  


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  Theoretical weight: Not specified

  
  


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  Compression ratio: 2-stroke (Wossner and OEM)

  
  

Cross-Reference OEM Part Numbers

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  Piston: 8075D025

  
  


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  Lock: CW16

  
  


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  Pin: WP027

  
  


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  Ring Set: RSB6425 x 2

  
  

Vehicle Fitments

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  Yamaha YFZ350 Banshee 1987–2007

  
  


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  Yamaha RD350 LC - YPVS 1980–1987

  
  


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  Yamaha RD350 AC 1950–2014

  
  


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  Yamaha RZ350 1982–1990

  
  


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  Yamaha RD350 1973–1975