Having just adjusted a few clearances at just under 80,000 Km, I want to encourage you guys TO check them. I checked them at 45ish thousand Km and one was only slightly out of spec so I left all well enough alone. This time I had two intake valves on Cyl #3 sitting at 0.003", which is obviously a little tight. I have heard people say that they checked them and were good so never again, but I think it is even more important to check them as the Km's on the bike start to creep up. Is it a bit of a pain?.......yes. Is it more of a pain to pull cams and reshim?.........Deffinitely. Valves and valve seats do wear.