Ducati MONSTER 821 Workshop Manual page 912

Pre-tighten screws (10) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm).
Pre-tighten one support at a time, working in the sequence 1-2-3-4-5-6-7-8.
Then tighten screws to a torque of 22.5 Nm (Min. 21 Nm - Max. 25 Nm).
Tighten one support at a time, working in the sequence 1-2-3-4-5-6-7-8.
Remove any excess of sealant from between the cylinder head and the cap.
Turn the camshafts by hand to check that they rotate freely.
Note
The first screw to work on, in position 1, must always be positioned on the intake and timing side.
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