I've got the bike stripped down for painting and figured I'd go through the motor and see how things look. I rebuilt the motor 2 years ago (new oil pump, numerous gears, piston, 450 cam, cam chain....) and figured now would be a good time for an inspection. It's a 2000 model year and I'm aware of the CB key issue, but what else? I hear a ticking sound coming from the head at idle, but I think its normal valve train noise. Other than that she purrs. What in the head is causing this ticking noise? What are the high wear items in the top end of this motor? I dont feel the cases need to be split, so no need to mention anything below the jug. Thanks!