Ducati 1098 2007 Manual page 436

section
N 4.2
Unscrew the bolts (22) holding the pulleys, turning them anti-clockwise through 90° ± 5°.
Check that the pulleys have no endfloat and can rotate freely at all points along the full length of the slots.
A
B
C
D
E
F
G
H
L
M
N
P
62
Engine
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22
22
1098/1098S - M.Y. 2007 - edition 00