Fourth Generation: Yamaha YZ450F 2006-2009
The YZ450F received a major update in 2006, with over 300 parts changed and improved. The power was smoothed out, and the bike was made easier to ride, putting to rest the complaint that the YZ had too much power. The four-speed transmission was replaced with a five-speed. An all new aluminum single backbone frame shaved another 10 pounds off the weight.It also was the most advanced bike of its time
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