OK, I am getting a new 06 YZ450F and it is my firsrt 4 stroke. I want the bike right ASAP because getting adjusted will on my mind and not imporvements. So, what should I do right away, soon after break in and what should I leave alone? I've read about changing out the front tire, some jetting issues and differant bars. Besides the normal set up of sag, etc..........what else do I need to do? Thaks in advance for your input.