You can get a tool to put valve springs on assembled engine if you do not wont to diassemble. Its less $$$ to do them now then to brake a spring & trash a eng.+ you can cheek the valve guides.

I recall reading a post on D&K's site back in december 08, from gizmo about him checking his motor out and the push rods being wore out and replaced..but he stated that he had gotten 4 yrs every weekend? So figure in his regular riding in ky and racing in the hillclimbs?? Is that a pretty good gauge on when you should check through a 2500??