havnt

First tripple I've had and lovin it, It runs spot on with the full Akro on it but a few people have commented on the fact that they havnt heard one with the high pitch whining/whistling noise is this normal as it runs spot on

hopefully some-one will give me the advise im after as im sick of looking and havnt a clue but basically im after a good helmet camera so any advise please ? many thanks in advance.

I found out why, when I used my rear brake, it made odd sound. I assume it is not supposed to move like that? Is it broken? I havnt touched it before, I know the dealer slacked my chain week or two ago... thanks :( https://www.youtube.com/watch?v=x6bZYfPNRig&feature=youtu.be