Super Jet High frequency sound from under Hood?

[JetMufassa]

2013 Superjet, with ADA Head, Pro-tec Dual Cooling, Factory LTD Pipe, V-Force 4 reeds, Flame arrestors, Scat Track 12/17, Flow Control valve. (about 10 Hours on the motor), Spark plus are perfect etc.

Pulls like and animal, no hestitation etc but when I'm running her I hear a high frequency noise... it's just audible. I'm ceratin it's the expansion chamber that's causing it. My son says I'm imagining things. When I sit down in the tray on my kness and bend forward I can clearly hear the high frequency sound. Anyone have an idea what could be causing this.


Thanks in Advance

 

[Kohldanielzimmer]

Make sure the pipe isnt rubbing against the motor mount

 

[oside-tanner]

Also make sure the chamber isn't hitting he side of the hull, I had to grind down the ribs on the hull that were near the chamber