I have a bike that is almost the same type that the vision xz 550, this bike is the yamaha xz 400, I bougth this bike two years ago, I decide to fix it but I have many problems to do. Can you help me? Maybe you know some webpage where I can download the manual of the xz 400 or xz 550. Maybe you can send me technical information about this bike. I need know how put on "time" the valves.