Ducati Monster 800 S 2003 Owner's Manual page 103

Warning
The shock absorber is filled with gas under
pressure and may cause severe damage if taken apart by
unskilled persons.
When carrying a passenger and luggage, set the rear
shock absorber spring to maximum preload to improve
motorcycle handling and keep safe clearance from the
ground. You may find that rebound damping needs
readjusting.
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