Ducati Monster 696 2009 Manual page 445

section
N 4.4
Valve–seat contact surfaces
Use Prussian blue or a mixture of minium and oil to check that the contact surface (W) between valve and seat is 1.0 to 1.5 mm.
Maximum permissible limit:
2.0 mm.
Grind the seat if the dimension measured is greater than above limit.
Fill the intake and exhaust ducts with fuel to check for leaks; if leaking occurs, check the sealing surfaces for burrs.
Overhaul of the valve guides
Carefully examine the internal surface of the valve guide: for cracking or distortion. If the guide is excessively out-of-round,
use a reaming tool to make the mating faces more uniform.
Notes
When you change the valve guide, you must also change the valve. The intake valve guides are made from cast iron,
whereas the exhaust valve guides are bronze.
Valve-valve guide clearance
Assembly clearance:
0.03 to 0.06 mm.
Maximum permissible wear limit:
0.08 mm.
Monster 696/696+ - M.Y. 2009 - edition 00
Engine
A
B
C
D
E
F
G
H
L
M
N
P
63