The optional KX FI Calibration kit allows adjustment of engine characteristics by using one of the pre-set maps included in the software or by adjusting the map to suit rider preference. Data logging function is included. Data can be downloaded from the ECU controller to the PC and it can be displayed as graphical data for analysis, and comparison with other riding data.In addition to the kit, lead (26011-0243), a computer and 12 V battery are also required. Additional plugs are available to quickly change pre-set engine mappings (260110728 black, 260110748 white)2013 model KX450F + KX250F