Input Shaft (Mainshaft) Speed Sensor Replacement

Do the battery removal procedure (see BATTERY REMOVAL AND INSTALLATION ).
Remove the air cleaner (see THROTTLE BODY CLEANING ).
Remove the battery base.
Disconnect the input shaft (mainshaft) speed sensor connector, and remove the input shaft (mainshaft) speed sensor (A).

Fig 1: Locating Input Shaft (Mainshaft) Speed Sensor Connector, And Input Shaft (Mainshaft) Speed Sensor With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the new O-ring (B) on the new input shaft (mainshaft) speed sensor, then install the input shaft (mainshaft) speed sensor.
Check the connector for rust, dirt, or oil, then connect the connector securely.
Install the battery base.
Install the air cleaner (see THROTTLE BODY CLEANING ).
Do the battery installation procedure (see BATTERY REMOVAL AND INSTALLATION ).