Ducati MONSTER Manuel De L'utilisateur page 120

Storing the bike away
If the motorcycle is to be left unridden over long periods,
it is advisable to carry out the following operations before
storing it away:
clean the motorcycle;
plug with its seal and empty the fuel tank;
pour a few drops of engine oil into the cylinders through
the spark plug seats, then crank the engine by hand a
few times so a protective film of oil will spread on
cylinder inner walls;
E
place the motorcycle on the supplied service stand;
disconnect and remove the battery. Battery should be
checked and charged whenever the motorcycle has been
left unridden for over a month;
protect the motorcycle with a suitable canvas available
from Ducati Spare Parts Department. This will protect
paintwork and let condensate breathe out.
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Important notes
Some countries - such as France, Germany, Great Britain,
Switzerland and so on - have compulsory emission and
noise standards.
Carry out any required inspection at regular intervals and
replace any parts using Ducati original spare parts
complying with local law.