Welcome to the forum, at 17K its most likley to be the camchain tensioner waiting to go to the next notch. How long has it been noisy?
They are not normally noisy but can get a bit rattly just before it clicks out. There are ways to "force it" but when was the last time the oil was changed? Maybe give it a change and flush it as this can help stop the tensioner getting stuck.
Whatever you do, do not consider replacing it with a manual one.