I just bought a left over 05 wr 450 the other day and while the mechanic was doing all the free mods ( throttle stop, grey wire, etc..) I ask him about the AIS and if he was going to take it off too. He didn't know what it was so he ask another mechanic that had just taken a class from Yamaha about it and he said they put a bolt in something and that takes care of it. He said something like you can either buy the 50.00 kit from Yamaha or just put a bolt in something and be done with it. I don't really know what the AIS is, but has anyone else heard this? My last bike was a 01 WR so this AIS stuff is new to me. Sorry don't have more info but the mechanic didn't seem really talkative.I wanted to talk to the guy a little bit more but was signing papers and he was busy working on somthing else and I didn't want to bother him. I am wondering if I need to go ahead and remove the AIS or if it is fixed? I haven't got to ride the bike very much, it has been cold and been busy. I figured you guys might know something about this or if it's not a good fix or not.