PIAGGIO X8 400 i.e. Owner's Manual page 17

Intermediate step - black key
After pulling out the red key, insert the black key within 10 seconds and promptly turn
it to «ON». After 1-3 seconds, turn the key to "OFF" again and pull it out. In this way,
a maximum of 7 black keys can be programmed by repeating the above procedure
keeping the indicated times.
Final step - red key
After pulling out the last black key, insert the red key again and turn it to "ON" (this
operation should be performed within 10 seconds of pulling out the previous key).
Leave it in this position for 1 to 3 seconds and return it to the «OFF» position.
Proper programming check
Insert the red key disabling the transponder (i.e., tilt the key cap by 90°) and turn the
key to "ON". Perform the engine start-up operation. Ensure that the engine does not
start. Insert the black key and repeat the start-up operation. Check that engine starts.
WARNING
SHOULD THE ENGINE START WITH THE RED KEY (WITH TRANSPONDER OFF),
OR IN THE EVENT OF WRONG OPERATION DURING PROGRAMMING, REPEAT
THE PROCEDURE FROM THE BEGINNING.
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