Model(s) covered: 2003 KTM 450 SX, 2003 Honda CRF 450 R, 2003 Cannondale X 440, 2003 Yamaha YZ 450 F
By now it's a foregone conclusion the two-wheeled off-road world will one day be filled exclusively with the sounds of deep, throaty 4-strokes. The impending extinction of 2-stroke machines isn't even a topic of conversation in the industry anymore. However, the level at which 4-strokes currently perform has turned the motorcycle world on it's axis and changed the way riders, dealers, and manufacturers view the world.
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