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A new, seat increases comfort over the course of long motos and has a non-slip surface.
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Revised front suspension settings for improved bump absorption, and reduced rider fatigue.
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Aluminum alloy shift and rear brake levers are lighter, and provide a more positive feel.
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Liquid-cooled, 439cc, 5-valve, DOHC, four-stroke with titanium valves features 95mm bore and 62mm stroke delivering, broad torque curve (for instant hook-up) with high over-rev capacity and crisp, linear throttle response.
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Reliable, push-button electric start in any gear adds extra convenience.
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High performance 39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) delivers ultra-precise fuel/air mixing and instant throttle response.
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Dry sump engine carries oil in an aluminum tank directly in front of the engine for excellent cooling and optimal protection from rocks or mud.
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Forged piston features short skirt and small pin boss diameter to help reduce weight.
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Lightweight titanium valves (first ever on an ATV) and load-reduced springs are super light, minimizing reciprocating mass for fast-revving, hard-hitting power delivery across the RPM range.
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Additional weight-saving engine features include: magnesium cylinder head cover & right side crankcase cover; small-design cam chain tensioner and oil pump; aluminum oil hose; and light CDI ignition unit.
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Ignition coil is integrated into the spark plug cap, the first time ever used on an ATV, and is extremely light and compact.
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Trick, works-style clutch lever features oversize barrel adjuster for easy, no tool adjustability of lever/cable play.
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Independent aluminum upper A-arm front suspension features fully adjustable competition-spec Kayaba piggyback shocks with 9.1 inches of travel and separate adjusters for preload, rebound and compression damping.
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Rear suspension system is a YZ linkage-type that features fully adjustable Showa shock with 10.1 inches of travel and separate adjusters for preload, rebound and compression damping.
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Removable aluminum die-cast rear subframe removes easily for maintenance.
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High-performance 21 x 7R-10 front and 20 x 10R-9 rear Dunlop radials, designed specifically for the YFZ450, deliver superb, class-leading traction.
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Digital CD ignition system delivers ultra-precise spark and 3D timing for faster, stronger engine response during hard acceleration.
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Lightweight crankshaft keeps inertial mass to a minimum for faster-revving low-rpm response.
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High-performance stainless steel exhaust header (and heatshield) is mated to a USFS-approved spark arrestor which looks trick and resists corrosion.
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The large-capacity radiator is optimally mounted in the frame to keep the center of gravity low but away from mud or rock damage and provides outstanding cooling efficiency.
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Heavy-duty manual clutch features extra-thick plates specifically designed for the YFZ450.
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Large capacity airbox features no-tool access to the oiled dual foam filter for easy maintenance.
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State-of-the-art high-tensile steel chassis utilizes the most advanced suspension technology ever fitted to an ATV for pure-competition-spec performance right off the showroom floor.
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Ultra-rigid cast aluminum swingarm reduces weight and ensures optimal, flex-free suspension action.
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Numerous aluminum components—including the swingarm, upper A-arms, oil tank and wheels —help keep overall dry weight down to a paltry 350 pounds.
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Lightweight front and rear master cylinders, combined with twin 160mm front discs with twin-piston calipers and single 200mm rear disc, deliver incredible stopping power with progressive control and feel.
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Ultra-compact, race-bred chassis design creates a short 50.4-inch wheelbase and low center of gravity to create a super-tight turning radius.
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Long, low and narrow YZ-style seat enhances the low center of gravity for quick, balanced steering and optimal rider movement.
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Lightweight aluminum wheels help enhance suspension performance by reducing unsprung weight.
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Aggressive YZ-inspired styling of front cowl, tank, fenders and seat establishes this machine’s pure competition purpose.
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Dual 30-watt multireflector halogen headlights set back in the front cowl add the perfect menacing appearance. Taillight has an incorporated brake light for added convenience.
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Rugged 45mm-wide serrated footrests provide excellent grip and rider comfort.
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Large-capacity, 2.6 gallon fuel tank ensures excellent range.
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Easy-to-use, toggle link-type handlebar-mounted parking brake can be set with one hand.
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Specs, Quotes, Overview
Standard Features
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