Ducati MONSTER 821 Workshop Manual page 858

Lock dial gauge (V) into the seat support (T) and position probe (R) against the face of the closing shim.
Set the dial gauge to zero when the valve is fully closed.
Rotate the intake camshaft so as to allow the intake valves to lift fully.
Check on the dial gauge that the measured value corresponds to the prescribed one.
Repeat the same operation for the exhaust valves, using dial gauge (V) in support seat (S) and probe (U).
Specified values:
Valve lift
Valve lift with valve clearance of 0 mm
Timing diagram
Timing diagram with valve lift of 1 mm
Intake 11.30 mm
Exhaust 9.60mm
Opening 4° B.T.D.C.
Intake
Closing 52° A.B.D.C.
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