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BBR Motorsports 120cc Big Bore And Cam Kit Honda XR100R / CRF100F 1981-2015

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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

BBR Motorsports 120cc Big Bore And Cam Kit Honda XR100R / CRF100F 1981-2015 Resources

BBR Motorsports 120cc Big Bore and Cam Kit Honda XR100 / XR100R / CRF100F

BBR Motorsports celebrates one of the best selling dirt bikes of all time with this high-compression 120cc big bore engine kit for the XR/CRF 100. Increased displacement, higher compression and large cooling fins enhance the performance and longevity of the motor. This is the only XR/CRF100 bore kit that matches the new rocker arms perfectly to the new high-performance BBR cam shaft. This kit is ready to go and bolts on with no case boring required. Dyno tests show more than 2HP gain with this kit.


  • Increased displacement and higher compression design
  • BBR large fin aluminum cylinder with steel sleeve
  • New rocker arms and adjusters
  • BBR high-performance camshaft and HD valve springs
  • 58mm piston, ring set, pin and clips
  • Gasket kit including cylinder head and cylinder base gaskets

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Please review this product's fitment notes & exceptions prior to purchase: Add to Cart

This product is vehicle specific. Click here to select your vehicle to ensure fitment.

Fitment Notes & Exceptions
  • Professional installation and carburetor rejetting recommended

This Product Fits:

CRF100F 2004-2015
XR100 1981, 1982, 1983, 1984
XR100R 1985-2003

This item is also available for 12 other models:

CRF150F 2003-2005
CRF230F 2003-2019
CRF50F 2004-2023
XR50R 2000-2003
KLX110 2010-2016
KLX110 2003-2009
KLX110L 2010-2016
DR-Z110 2003-2005
TTR125 2000-2015
TTR125E 2000-2016
TTR125L 2000-2008
TTR125LE 2003-2023
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style BBR Motorsports 120cc Big Bore And Cam Kit Honda XR100R / CRF100F 1981-2015 Item # 10127035 Store SKU Manufacturer Product # 411-HXR-1001 Availability In Stock: Ships next business day
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