Ducati Monster 796 Workshop Manual page 59

Maintenance operations
Unscrew the screws securing the horizontal head covers (5) and the vertical head ones then remove the covers.
Unscrew the two retaining screws (14) of the centre cap (15) over the end of the crankshaft.
Fit the tool handgrip 88713.0123 in the holes of the generator cover to be able to turn the crankshaft so that the valve
on which the control is carried out is in rest position.
With the valve in the rest position, slide a feeler gauge between the opening rocker and the opening shim to measure the
clearance.
The clearances must be within the specified limits:
Opening rocker arm
INTAKE:
Adjusting clearance
Checking clearance
EXHAUST:
Adjusting clearance
Checking clearance
(A)
0.10 to 0.15 mm
0.10 to 0.15 mm
(A)
0.10 to 0.15 mm
0.10 to 0.15 mm