APRILIA SR 50 Workshop Manual page 40

PERIODIC MAINTENANCE
CHANGE KEYS: The instrument panel manages the
immobilizer function through encoded keys. In case the keys
are lost or the kill switch is changed, it is possible to encode
up to 4 keys using this procedure.
At the beginning of the procedure you will be prompted to
enter the USER CODE.
WARNING
The user code stored on a new vehicle is
00000.
The instrument panel prompts you to insert the first key:
WARNING
The first key is the one already inserted. Wait
for the key to be stored and the second key to
be requested.
Insert the second key within twenty seconds from the
request.
Proceed with the other keys or let the countdown reach zero
to end the operation.
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SR 50