14-18 YAMAHA YZ250F: GYTR Power Tuner This easy plug-in fuel-injection and ignition tuning tool allows riders to quickly adjust the fuel and ignition maps to suit riding conditions and rider preference.Allows nine easy-to-program adjustment points for both the fuel and ignition maps.Monitor f WR&reg;450F and WR&reg;250F require GYTR&reg; Competition Kit / ECU (sold separately). Check the attached PDFs for baseline settings.GYTR&reg; P/N: 33D-H59C0-V1-00.