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YFZ450 - Head the competition

Ever wondered what that ATV in front of you is? Chances are it’s a YFZ450. With the highest power-to-weight ratio of any production ATV, this multi-championship-winning machine has been the racer’s choice for the last five years. The lightweight alloy single-cylinder four-stroke engine has a five-valve cylinder head fed by a Keihin 39mm carburettor the biggest and most sporting carb in Yamaha’s ATV range that powers it past the opposition in a surge of terrain-swallowing energy. YFZ450’s superlight, high-tensile chassis with remote-reservoir race-tuned front suspension turns every ounce of power into forward motion, with the race clutch taking everything you can throw at it. This year, there’s a new colour scheme to look out for. It may be a bit blurred as it goes past, though.

	Key Features:
	The lightest, most powerful ATV ever, winner of just about every magazine shootout. Most powerful, industry-exclusive, five-titanium-valve engine and 350-pound dry weight give the YFZ450 the best power-to-weight ratio of any ATV ever produced. Ultra-compact, lightweight, high-tensile steel frame with fully adjustable suspension means YFZ450 is also the best handling race bred ATV ever produced. The YFZ450 comes standard with pushbutton electric starting, a convenient flip-type parking brake and suspension calibrated for performance.
	Engine:
	449cc liquid-cooled, DOHC four-stroke with five titanium valves features 95mm bore and 63.4mm stroke for massive power with high over-rev capacity and crisp, linear throttle response. Large-capacity radiator is optimally mounted in the frame to guard against damage. Reliable, pushbutton electric start in any gear adds extra convenience. High performance 39mm Keihin FCR flat-slide carburettor with throttle position sensor (TPS) delivers ultra-precise fuel/air mixing and crisp throttle response. Additional weight-saving engine features include: magnesium cylinder head cover and right side crankcase cover; small-design cam chain tensioner and oil pump; aluminium oil hose; and light CDI ignition unit. Trick, works-style clutch lever features oversize barrel adjuster for easy, no tool adjustability of lever/cable play. Dry sump engine carries oil in an aluminium tank directly in front of the engine for excellent cooling and optimal protection from rocks or mud. DC ignition system delivers ultra-precise spark and 3D timing for faster, stronger engine response during hard acceleration. High-performance stainless steel exhaust header is mated to a USFS-approved spark arrestor. Smooth-shifting YZ-spec ratchet-type five-speed transmission and heavy-duty clutch deliver all that power to the rear tires with maximum efficiency. Large capacity airbox features no-tool access to the oiled dual foam filter for easy maintenance. Ignition coil is integrated into the spark plug cap; extremely light and compact.
	Chassis/Suspension:
	Independent aluminium 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. New rear suspension system is YZ linkage-type, controlled by a fully adjustable Showa shock with 10.6 inches of travel and separate adjusters for preload, rebound and compression damping. Ultra-rigid cast aluminium swingingarm reduces weight and ensures optimal suspension action. Titanium heat shield is super light and strong. Long travel out back means an excellent ride and handling. Eccentric chain adjuster mechanism simplifies that job, and a twin-piston rear brake caliper provides strong, controllable rear braking. Numerous aluminium components including the swingingarm, upper A-arms, oil tank, grab bars and wheels help keep overall dry weight down to a paltry 350 pounds. Controlled Fill cast aluminium subframe is light and super-strong. Lightweight front and rear master cylinders, combined with twin 161mm front discs with twin-piston calipers and single 200mm rear disc, deliver incredible stopping power with progressive control and feel. High-performance 21x7R-10 front and 20x10R-9 rear Dunlop radials, designed specifically for the YFZ450, deliver superb, class-leading traction. Long, low and narrow YZ-style seat enhances the quick, balanced steering and optimal rider movement.
	Additional Features:
	Rugged 45mm-wide serrated footrests provide excellent grip and rider comfort. Large-capacity, 2.6 gallon fuel tank ensures excellent range. Dual 30-watt multireflector halogen headlights set back in the front cowl add the perfect menacing appearance. LED taillight is tough, draws less current and has an incorporated brake light for added convenience. Easy-to-use, toggle link-type handlebar-mounted parking brake can be set with one hand.

	Technical Specifications
	Engine
	Type	449cc liqiud-cooled w/fan, DOHC 4-stroke single; 5 titanium valves
	Bore x Stroke	95mm x 63.4mm
	Compression Ratio	11.4:1
	Carburetion	Keihin 39mm FCR w/throttle position sensor
	Ignition	DC - CDI
	Starting System	Electric
	Transmission	5-speed manual clutch
	Drive Train	2WD; sealed o-ring chain, eccentric adjustment
	Chassis
	Suspension/Front	Independent double wishbone, 9.1” travel; adjustment for compression, rebound and spring preload
	Suspension/Rear	Aluminum swingarm, 10.6” travel; adjustment for compression, rebound and preload
	Brakes/Front	Dual hydraulic discs, twin pistons
	Brakes/Rear	Hydraulic disc, twin pistons
	Tires/Front	AT21 x 7-10 radial
	Tires/Rear	AT20 x 10-9 radial
	Dimensions
	L x W x H	72.4 x 46.1 x 42.9
	Seat Height	31.9
	Wheelbase	50.4
	Ground Clearance	4.4
	Fuel Capacity	2.6 gal.
	Dry Weight	350 lb.
	Other
	Lighting	Dual 30W Krypton multireflecter headlights and 3.9/0.5W brake light