This Wossner forged piston kit with a 74.50mm nominal bore (actual 74.43mm) is engineered for ROTAX SWM250 models from 1979 to 1982. Designed for two-stroke engines, it delivers high strength and optimised thermal conductivity for demanding applications.

Features

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  Forged piston construction ensures exceptional strength and durability

  
  


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  Precision engineering enhances heat transfer from combustion chamber to cylinder wall

  
  


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  Elliptical profile distributes load evenly, reducing localised stress and preventing piston failure

  
  


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  Manufactured in Germany with strict quality standards

  
  

Specifications

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  Bore Size: 74.50mm (actual 74.43mm)

  
  


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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: RSB7450 x 2

  
  

Vehicle Fitments

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  ROTAX SWM250 1979–1982