The biggest change for 2009 Yamaha YZ450F is the swingarm. Its hydro-formed shape is altered to give the bike a claimed improvement in cornering and traction by reducing the rigidity in twisting motion and in vertical stiffness. It is stiffer horizontally, or in loads placed from the side as well as being 350 grams lighter.
Inside the engine is one significant update. It is the use of longer shift fork bars which allows the bar to have more shaft surface area inside the cases which makes it harder for the forks to bind during shifts, especially between second and third. There is a small update to the ignition stator plate where it received a fourth mounting point and the color of the valve cover now matches the side covers in black.
[Source: Yamaha]
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