Triumph engines are noisy engines. Unless it becomes excessive don't worry about it.
Certain people (no names!) have compared the Triumph Triple to a pinball machine during multi-ball play, or a sewing machine with a bearing loose. Those certain people have also been accused of having a bearing loose.
For further trials and tribulations on the notorious triple, read this:
Maddening Noise Issue
Sure it's a T300 bike, but the principal is the same. Note: the noise is still there.