These things are noisy runners and it's often difficult to sort out potential problems such as piston slap or valve noises from the "normal" mechanical sounds, particularly if you haven't owned one from new. To me these things sound as if they're ready to come unglued at any given point, but they don't.
Adding/eliminating accessories such as skid plates and fuel tanks or even wearing a different helmet affects the reflected harmonics all over again. Whole other set of weird noises to get used to, and some of the previous sounds disappear entirely.
I'd hesitate to say your ticking is just the nature of the beast because I haven't heard it. But if all of your maintenence is up to date and it doesn't sound like catastrophic metal munching I'd say roll widdit.
One possibilty is cam chain slap. If you haven't adjusted the cam chain tensioner give that a shot. It costs nothing and needs to be done, anyway.