the borg
New member
You realize that Yamaha actually lists the AIS block off plate as an available accessory on their website. I must be harmful if Yamaha offers it. There is no way you will notice any kind of performance change by disabling the AIS. And it does not cause more soot on the tailpipe. If the only thing you do is disable the AIS and you have excessive soot on your tailpipe then you have other problems. Especially if you still have the stock fuel setting.