It sounds about like mine does. I think that's probably normal.
You have got the same problem I had with my Triumph. I rode a K75 for a long time. The thing just makes this gentle mechanical chatter, like a sewing machine.
So when I switched the my Triumph, another inline 3 motor, I was shocked at the level of mechanical racket it made - I heard lots of ticking and tacking and rattle and all manner of noises and I thought to myself "This can't be normal!" so I took it by the dealership like 3 or 4 times in the first year having them check out noises it was making - always the same answer "Nope, that's just the sound it makes."
So from that experience I've gotten a little perspective in that a lot of engines just make a racket, It's normal - they're full of springs and ... bits of metal that ride along on other bits of metal and all manner of things that make noise.