The starting circuit Yamaha XS650 consists of the starter motor, starter relay, starter cut-out relay, and the starting-circuit cut-off relay. If the engine stop switch and the main switch are both on, the starter motor can operates only if: The transmission is in neutral (the neutral switch is on); Or if the clutch lever is pulled to the handle-bar (the clutch switch is on) and the sidestand is up (the sidestand is on). The following schematic illustrates the Yamaha XS650 Starting System Circuit and Wiring Diagram. (click image to enlarge)
The starting circuit cut-off relay prevents the starter from operating when neither of these conditions has been met. In this instance, the starting circuit cut-off relay is off so current can not reach the starter motor. When on or both the above conditions have been met, however, the starting-circuit cut-off relay is on, and the engine can be started by pressing the starter switch.
The starting system also has a starter cut-out relay which protects the starter motor during engine operation. After the engine has started, the tachometer control unit sends current to the starter cut-out relay. The relay switches off, interrupts the current flow to the starter motor, and the starter ceases to operate.