Kit is designed to correct starting problems in motorcycles with high compression ratios or large displacement engines that use Twin Tec PART #s DS-242373 and 2101-0241 single-fire installationsThe combined draw of the starter motor, single-fire coil and the long length of wire between the battery, engine stop-run switch and the coil may leave too little energy at the coil to provide enough spark to fire the engine the power relay kit solves the problem by supplying full battery voltage to the coilKit includes a high-quality relay, wire and all required terminalsMade in the U.S.A.