This Wossner forged piston kit features a 64.50mm bore size (64.44mm actual) and serves as a +1.00mm oversize replacement for KTM 175 GS and MC models from 1977 to 1982. Designed for two-stroke engines, it offers advanced heat transfer and structural integrity under high-performance demands. The piston’s elliptical shape ensures optimal load distribution during expansion, reducing stress concentrations and enhancing reliability.

Features

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  Forged for high strength and thermal performance in two-stroke applications

  
  


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  Elliptical design promotes uniform load distribution under heat expansion

  
  


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  Precision-machined in Germany for consistent performance and durability

  
  

Specifications

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  Bore Size: 64.50mm (actual 64.44mm)

  
  


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  Stroke: 54.00 mm

  
  


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  Clearance: 0.06 mm

  
  


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  Compression Ratio (Wossner): 2-stroke

  
  


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  Compression Ratio (OEM): 12-stroke

  
  


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  Dome Volume: Not specified

  
  


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  Compression Height: 37.00 mm

  
  


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  Lock Part Number: CW15

  
  


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  Pin Part Number: WP011

  
  


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  Ring Set Part Number: RSB6450

  
  

Cross-Reference OEM Part Numbers

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  56-W967.100.WO

  
  

Vehicle Fitments

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  KTM 175 GS (1977–1982)

  
  


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  KTM 175 MC (1977–1982)