This Wossner forged piston kit is designed for the Honda CR85 from 2003 to 2009, featuring a 47.50mm bore and a 47.45mm piston diameter. Engineered for optimal strength and thermal efficiency, it delivers precision and durability for high-performance two-stroke applications.

Features

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  Forged construction ensures superior strength and longevity

  
  


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  Designed for effective heat transfer from combustion chamber to cylinder walls

  
  


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  Elliptical piston profile distributes load evenly during expansion, minimising localised pressure and risk of piston collapse

  
  


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  Manufactured in Germany for consistent quality

  
  

Specifications

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  Bore Size: 47.50 mm

  
  


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  Piston Diameter: 47.45 mm

  
  


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  Compression Height: 24.00 mm

  
  


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  Stroke: 47.80 mm

  
  


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  Clearance: 0.05 mm

  
  


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  Compression Ratio: 2-stroke (Wossner and OEM)

  
  


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  Displacement: 84 cm³

  
  

Cross-Reference OEM Part Numbers

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  Wossner Piston Kit: 8105DA

  
  


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  Alternate Piston Kit Reference: 56-W833.A.WO

  
  


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  Lock: CW14

  
  


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  Pin: WP058

  
  


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  Ring Set: RSB4750

  
  


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  Rod: P2003

  
  

OEM References:

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  PIN, PISTON: 13111-GC4-600

  
  


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  PISTON B: 13120-GBF-B40

  
  


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  RING, PISTON TOP: 13121-GBF-B41

  
  

Vehicle Fitments

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  2003 Honda CR85

  
  


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  2004 Honda CR85

  
  


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  2005 Honda CR85

  
  


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  2006 Honda CR85

  
  


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  2007 Honda CR85

  
  


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  2008 Honda CR85

  
  


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  2009 Honda CR85