When do I know?

[Barnapkin]

I'm getting ready to do the valves on my bike, and once again a question that I don't know the answer to comes to mind. How do I know if the valve seats are worn/need replacing?

Do I adjust the valves and then do a compression check to see if I have a loss of pressure?

[Iconic944ss]

Quite a lot of info here:

Ducati Suite- Advanced Maintenance

I think you would be looking to a compression test if you have valve seat concerns.