Playing with the front wheel with it off the ground (no, not wheelies) should show if the bearings need to be replaced. I am pretty sure this is described in the manual. I would not bother to replace bearing or seals until I had some evidnece they were bad. As for lube, the manual specifies high temp grease for the seals, which Moly 60 is not. FWIW, I have 66,000 miles on the orig. bearings and seals with no sign of trouble.