As far as I know the exhaust valve in the Gen2 is only there to cheat noise regulations which are measured when the bike is in gear and moving and the revs are somewhere between 4k & 5k.
This video shows a fully working valve, it's not easy to make out but you can see the valve is open at low revs, closes around 4k, and then is fully open again around 5k and stays that way - https://youtu.be/UGA3kaBHzVc?feature=shared
This video maybe demonstrates the issue Scotty_vr is having !?! where the valve doesn't seem to be doing anything when the engine is being revved I believe that this is because the bike is not in gear therefore the noise reduction is not required - https://youtu.be/9h4PkpWy7jo?feature=shared
This video shows a fully working valve, it's not easy to make out but you can see the valve is open at low revs, closes around 4k, and then is fully open again around 5k and stays that way - https://youtu.be/UGA3kaBHzVc?feature=shared
This video maybe demonstrates the issue Scotty_vr is having !?! where the valve doesn't seem to be doing anything when the engine is being revved I believe that this is because the bike is not in gear therefore the noise reduction is not required - https://youtu.be/9h4PkpWy7jo?feature=shared