Is there anywere I can download owners manual for YZF 450? Why I need it: I have always driven 2 strokes but now I am about to buy a YZF 450 4- stroke. What I have heard you need to adjust the valves all the time (true?). Now I would like instructions on how to do that so I can get a glimch on how hard work it is and if I need to purchase special tools for the adjustments. Thank!