Solenoid Relay For Some Apollo and For Kayo 50cc-250cc Pit Bikes ATV This solenoid relay is designed for use with select Apollo and Kayo pit bikes and ATVs in the 50cc to 250cc range.It functions as a key electrical component that helps control the flow of power within the starting system.The relay ensures engagement of the starter motor when activated, supporting consistent ignition performance.It is engineered to fit specific models within these brands and serves as a direct replacement for.Installation is straightforward, aligning with standard mounting configurations found on compatible vehicles.