Anytime. I adjusted my valves on the blue bike in my signature at 150k and it was a waste of time, actually. 2 of the valves were off less than the tolerance. If you use synthetic oil and change it every 5k miles, you won't have enough wear on the valve train.
Make sure he changes the clutch fluid as well. I just got my parts to replace the clutch slave cylinder over the weekend, so I will be working on that this coming weekend. My current Valkyrie has 107k.
Hay

Jimmyt