Ducati Monster 695 User Manual page 405

Head unit: valves - rocker arms
Checking the valve seat
Visually inspect valve seats: they must not show any signs of pitting or cracks.
If the seat is slightly damaged, mill the seat, using suitable 45° cutters, then grind the valves and check valve
sealing. If valve seat is excessively damaged, replace it choosing an adequately oversized valve seat. Spare valve
seats are available with 0.03 and 0.06 mm outer diameter oversize.
Caution
If seats are replaced, change the valve guides as well.
Overhauling the valve guide
Check inner surface of valve guides for cracking or distortion. If exceedingly oval, hone mating surface with a bore
reamer.
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