Stu,
lifter tapping is quite common and nothing I would worry to much about.
But you're new to this bike and biking in general, so any unfamilar sound is worth looking into.
Got warranty? Check into what that covers, as in the type of failure of the original poster. With 5k miles I wouldn't worry about that yet, but it has happened. And if you don't have a maitenance history, you don't know if this is going to be a problem.
Whens 1st maitenance? You might ask them if they have any history on the bike and whether they inspected the clutch, cam chain or anything else.
Let us know what kind of BS they thow at you. We have great BS detectors here.