This Wossner forged piston kit features a 74mm nominal bore (actual 73.93mm) and is designed for ROTAX SWM250 models from 1979 to 1982. Engineered for two-stroke applications, it offers enhanced durability and thermal efficiency for high-performance engines.

Features

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  Forged construction provides superior strength and reliability

  
  


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  Designed for optimal heat dissipation from the combustion chamber to cylinder walls

  
  


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  Elliptical shape ensures balanced bearing pressure and effective thrust load management

  
  


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  Manufactured in Germany with high precision and quality control

  
  

Specifications

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  Bore Size: 74mm (actual 73.93mm)

  
  


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  Stroke: 57.50 mm

  
  


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  Clearance: 0.06 mm

  
  


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  Wossner Compression Ratio: 2 stroke

  
  


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  OEM Compression Ratio: 2 stroke

  
  


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  Compression Height: 34.00 mm

  
  


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  Lock Part Number: CW18

  
  


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  Pin Part Number: WP033

  
  


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  Ring Set Part Number: RSB7400 x 2

  
  

Vehicle Fitments

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  ROTAX SWM250 1979–1982