Starting circuit operation
The starting circuit on this model consists of the starter motor, starter relay, and the starting-circuit cut-off relay. If the engine stop switch and the main switch are both on, the starter motor can operate only if:
a. The transmission is in neutral (the neutral switch is on).
b. The clutch lever is pulled to the handlebar (the clutch switch is on) and the sidestand is up (the sidestand switch is on.)
Starting-circuit cut-off relay inspection
1. Open the seat, and remove the fuel tank.
2. Remove the starting-circuit cut-off relay from the frame, and disconnect the connector.
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 cannot reach the starter motor.
When one or both of 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.
1. Starting-circuit cut-off relay
3. Check the resistance of the relay coil windings with the pocket tester. If the resistance is not within specification, replace the relay.
4. Check the relay function with a 12 volt battery and the pocket tester. Connect the leads as shown in the illustration. If the resistance readings do not equal those shown in the illustration, replace the relay.
5. Check the diode in the starting circuit cut-off relay with the pocket tester as shown in the illustration. Replace the relay if the diode is damaged.
Only the Yamaha Pocket Tester will give a 9.5Ω reading when testing continuity. The particular characteristics of other testesr will very the continuity test readings.