Fits CRF/XR50, CRF/XR70, CRF/XR80, and CRF/XR100 to eliminate the 9800 rpm rev limiter and provides a hotter advance curve.

This Rev Box also fits the Honda Z50R with electronic ignition (1988-1999). It will not work with any ignition that uses points.

• Eliminates the 9800 rpm rev-limiter of the OEM ignition
• Direct replacement for the OEM CDI ignition box
• Simple plug in installation