Examination
1. The starter circuit breaker switch is located near the upper end of the clutch pedal. Two wires are connected to the switch, one from the starter relay, the second is ground. When the ignition key is turned to the START position and the clutch pedal is depressed, the switch causes the starter relay to be shorted to ground, which activates the starter motor.
2. If the engine does not turn over when the clutch pedal is depressed, it is necessary to adjust the switch sensor and then try again. If the adjustment does not help to achieve the desired result, check the condition of the switch sensor and replace it if necessary. If the engine starts when the clutch pedal is released, adjust the switch sensor and try again.
3. If the engine does not turn when the clutch pedal is depressed, then either the conductivity between the terminals of the sensor-switch is broken, or the latter is not supplied with power from the starter relay.
4. Check the power supply with a voltmeter or test lamp. When the ignition key is turned to the START position and the pedal is depressed, there should be voltage on the wire coming from the starter relay. If there is no voltage, check the wiring between the relay and the sensor-switch for a break. If the power is supplied correctly, check for voltage on the opposite side of the sensor-switch (with the clutch pedal depressed). The presence of voltage on both sides of the sensor-switch confirms that it is functioning properly. Try adjusting it. If there is no voltage, replace the sensor-switch.
Replacement
Disconnect the wiring connector, loosen the adjusting nut and unscrew the sensor-switch from its support bracket. Installation is carried out in the reverse order.
Adjustment
Loosen the lock nut and, by rotating the sensor switch, ensure that there is conductivity between its terminals with the clutch pedal depressed.
(Information obtained from this source HondaBook.ru)