Wossner forged piston kit 8861DB is a +0.01mm oversized piston with a 66.01mm bore (measured at 65.96mm), specifically designed for the Honda CRF150R models from 2012 to 2018. Featuring a Teflon-coated skirt and precision-engineered forged construction, this piston ensures excellent durability, thermal performance, and a precise fit for high-revving four-stroke engines.

Features

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  Forged construction provides maximum strength and longevity

  
  


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  Elliptical design ensures even pressure distribution during thermal expansion

  
  


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  High-efficiency heat transfer from the combustion chamber to cylinder walls

  
  


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  Hard Teflon skirt coating enhances fit and bore conformity

  
  


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  Reduces localised stress to prevent piston collapse

  
  


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  Made in Germany

  
  

Specifications

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  Bore: 66.01mm (Measured: 65.96mm)

  
  


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  Display Volume: 149 cm³

  
  


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  Stroke: 43.80mm

  
  


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  Clearance: 0.05mm

  
  


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  Compression Height: 20.60mm

  
  


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  Wossner Compression Ratio: OEM

  
  


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  OEM Compression Ratio: 11.70:1

  
  


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  Dome Volume: -1.40 cm³

  
  


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  Part No.: 56-W914.B.WO (Wossner 8861DB)

  
  


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  Ring Set: 660XKS

  
  


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  Lock P/N: CW14

  
  


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  Pin P/N: WP058

  
  

Vehicle Fitments

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  2012 Honda CRF150R

  
  


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  2013 Honda CRF150R

  
  


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  2014 Honda CRF150R

  
  


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  2015 Honda CRF150R

  
  


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  2016 Honda CRF150R

  
  


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  2017 Honda CRF150R

  
  


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  2018 Honda CRF150R