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Behind David Knight's 450XC Photo Gallery

Behind David Knight's 450XC - Shawn Mundy may have the toughest mechanic's job in motorcycle off-road racing.

Slideshow
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When Mundy does his part, Knight usually holds up his end of the deal with results like this.
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Most GNCC riders chose a 2-stoke due to fatigue after 3 hours of riding. Knight is fine with a 450.
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Mundy was tapped to work with Knight once he made the switch to full-time American racing.
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The Twin Air filter pin is safety-wired, and extra foam to keep dust out.
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Holes in the engine guard for cooling.
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Fluidyne makes thicker radiators to keep things cool.
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Safety wire on footpegs.
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Mundy and Knight check all the details before a 3-hour race.
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Brembo takes care of the braking duties. Not only do they have to be strong, but they can't fade over the grueling race.
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The rear master cylinder is one of the tricker works parts. It has tolerances machined so tight that it doesn't require any seals.
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That wheel has to be tough enough to take a serious pounding for three hours and not fail. Mundy relies on Talon's carbon fiber hub.
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FMF pipes are found on a lot of factory bikes, Knight's included.
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David likes a little more bite to his motor than the stock XC provides, but other than a SX-style ignition curve, the 450cc engine is relatively stock.
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Larger gas tank by IMS.
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KTM racing has a deal with Motorex to keep their engines well lubricated.
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Knight uses a massive 52mm WP fork.
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Riding under the Factory KTM tent is about as high-status as you'll find in off-road racing.