I have recently sold my 2001 YZ250F and bought myself a 05 WR450 since most of my riding is woods and desert. I must say I am very impressed and surprised with the power this thing has. My throttle stop is cut, grey wire disconnected and baffle is out of the exhaust. I have been reading on this site, which is awesome, and have learned that my needle is not adjustable? What is up with that? What is recommended for riding in altitudes between 2500 and 7500 ft. Also, no fuel screw? Will an external fuel screw work and how do you get to it. My dealer said something about drilling out a plug? I am very happy with the bike and don't want to sound like a whiner but... these are the things that I would expect from the TTR line. Can someone also tell me a little about the JD kit. What does it come with and does it come with recommendations or a chart? Last question, I swear, does the AIS decrease power or performance in any way? I was hoping they had non-green sticker models. Oh well. I still love this bike a ton and would not buy anything else. Thanks in advance for taking the time to read and hopefully answer some questions for me.