Your saying "knock" or do you mean tick?
Are you revving the motor as it is warming up or what? Its a no no to do.
If you get a tick it is from the hydraulic chain adjuster. Yes in some bikes it happens and in time just might go away for good.
Your bike is new so every thing has to seat and break in. Give it time and you'll love it more then you do now.
Please add your state and model of bike you have. Click user CP @ top of page and then far left click edit signature. Thanks