I saw owners manual for Stornello over on GuzziTech site, look in downloads. I PM'd Bill, he may show up, he own's one.
EDIT Here's part of it
In order to maintain the effectiveness of the MGCT system following the replacement
of one or both tyres or in the case of serious wear, causing a non-compliant behaviour
of the MGCT, a calibration procedure of the system must be performed as follows on
a straight flat stretch of road.
� It is necessary that the diagnostic phase of the MGCT and ABS systems is complete:
for this purpose, after switching to (ON), ride a short distance above 5 km/h and wait
for the flashing of the two warning lights to stop.
� Allow the engine to idle for at least 5 seconds.
� Disable the MGCT control system by pressing the on / off button until the warning
light is steady lighting.
� Pull the clutch lever while pressing the starter button (1) for at least 5 seconds. The
activation of the process will be confirmed by the MGCT warning light (2) turning on
with slow flashing.
Accelerate to a constant speed of 30 km/h and maintain it for at least to 8 seconds.
The permanence of the vehicle speed in the correct field to complete the procedure
will be confirmed by a very quick flashing of the MGCT warning light (2).
• The end of the procedure will be indicated by the MGCT warning light (2) turning off.
The MGCT system is active.
• Once the procedure is completed, it is necessary to switch to (OFF) and wait for at
least 60 seconds before being able to switch again to (ON).
• In case of failure to complete the procedure within 5 minutes, the MGCT warning
light (2) will stay on steady and the MGCT system will remain off until switching to
(OFF).
• To reactivate the MGCT system, it must be switched again to (ON). It is however
necessary to repeat the process until it succeeds.
Looks like you use the kill switch too.