You will need a TORX T20 key.
1. Remove the air filter (see «Removal and installation of the air filter»).
2. Disconnect the wiring harness block from the regulator (with the ignition off).
3. Remove the two screws securing the idle speed controller to the throttle assembly (for clarity shown on the removed throttle assembly).
4. Remove the regulator...
5....and its O-ring.
Note. Replace a damaged or loose ring with a new one.
6. Install the regulator in the reverse order of removal.