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 kit is ready to go and bolts on with no case boring required. Fits ALL model year XR and CRF100's. From 1981-Present year
- Increased displacement
- High compression
- BBR Large fin, aluminum cylinder with steel liner
- 58mm piston, ring set, piston pin & clips
- Gasket kit including cylinder head and base gaskets
- Fits 1981-Present year XR/CRF100's
- Everything needed to install, You will need to rejet your carb or upgrade to a larger carb.
Works with stock camshaft and valve springs or optional BBR performance camshaft - part number 411-HXR-1020
