Yamaha YZF R6 2008
Hi cbrhonda907 and welcome to the site
Don't really understand what you mean(_When he brought it, it was derestricted. He has taken all the restricter kit off, ) _
I don't understand if when he bought the bike it was derestricted,so then he took the restictor kit off?.Don't know if its just me? but why would he take a kit off something that isn't resticted?so hasn't got one?.
The bike has an Exhaust valve,which is only there to keep the Decibel level down to a minimum at lower RPMs to meet sound laws,not a power valve to increase bottom end torque.Is it that he is getting a fault code which you have found to relate to a fault with the exhaust valve system?????.