2012 YZ450f strange noise.. video inside

I just started noticing this strange noise when my 2012 YZ450f is running.   Is this normal?   It's particularly noticeable at 22 seconds in through the end of the video.

 

To get this video I started the bike and started recording.  

 

https://www.youtube.com/watch?v=N3IiLVImUwM&feature=youtu.be

Sound normal,only thing I really heard was the hissing sound. On the left side is a little knob, make sure it is pushed in. If it is, rmember that the filter is up front under the tank and it is just a little noisier there.

Sound normal,only thing I really heard was the hissing sound. On the left side is a little knob, make sure it is pushed in. If it is, rmember that the filter is up front under the tank and it is just a little noisier there.

 

I recently got a 2012, and was hearing the hissing noise. I was like what the $#)# is wrong with the bike.. lol

I just started noticing this strange noise when my 2012 YZ450f is running.   Is this normal?   It's particularly noticeable at 22 seconds in through the end of the video.

 

To get this video I started the bike and started recording.  

 

 

The hissing noise sounded right when you were at the air intake.... Sounds like it was just sucking in air. Check it out 

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