Ducati MONSTER 821 Workshop Manual page 888

Locate the outer pulley (3) and the spacer (2).
Apply the indicated grease to the threads of the shaft.
Fit the ring nut (1).
Important
To prevent the ring nuts from loosening and consequent serious engine damage, always use new self-
locking ring nuts on all the timing belt rollers.
Block with tool (A) no. 88713.1805 the rotation of the belt rollers and tighten to 71 Nm (Min. 64 Nm -
Max. 78 Nm) the self-locking ring nut using the insert supplied with the wrench and a torque wrench.
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