Input Shaft (Mainshaft) Speed Sensor Replacement

Remove the intake air duct (see step 2 on REMOVAL ).
Remove the air cleaner housing (see AIR CLEANER REMOVAL/INSTALLATION ).
Disconnect the input shaft (mainshaft) speed sensor connector, and remove the input shaft (mainshaft) speed sensor (A).

Fig 1: Input Shaft (Mainshaft) Speed Sensor, O-Ring And Mounting Bolt With Torque Specification
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install a new O-ring (B) on a new input shaft (mainshaft) speed sensor, then install the input shaft (mainshaft) speed sensor in the transmission housing.
Check the connector for corrosion, dirt, or oil, and clean or repair if necessary, then connect the connector securely.
Install the air cleaner housing (see AIR CLEANER REMOVAL/INSTALLATION ).
Install the intake air duct (see step 9 on EXHAUST PIPE AND MUFFLER REPLACEMENT ).