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Yamaha Motorsports

2007 YFZ450

YFZ 450 Gray
YFZ 450 Gray

YFZ 450 Blue
YFZ 450 Blue

Key Features:

* The lightest, most powerful ATV ever, winner of just about every magazine shootout, 2004/ 2005 GNCC and Quadcross Championships, 2005/2006 World Four-Stroke Champion and ATV Illustrated's Sport ATV of the Year (a tie with our own Raptor 700R).
* 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.

New for 2007:

* New, ProTaper aluminum handlebar is light, strong and comfortable.
* New front brake master cylinder and lever gives excellent feel and feedback.
* New, drilled rear brake disc reduces unsprung weight and offers excellent feel and feedback.
* A new internal oil jet aimed at the piston bottom keeps things cool and well lubricated.
* An improved clutch offers consistent operation and big-time strength.

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 carburetor 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; aluminum 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 aluminum 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 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.
* 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 aluminum swingarm 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 aluminum components—including the swingarm, upper A-arms, oil tank, grab bars and wheels—help keep overall dry weight down to a paltry 350 pounds.
* Controlled Fill cast aluminum 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

Specifications

Engine Type – 449cc, 4-Stroke Single, Liquid Cooled w/ Fan, Titanium 5-Valve DOHC

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

Suspension/ Front – Independent Double Wishbone, 9.1” w/ Piggy back Rebound, Compression and Threaded Preload Adjustment.
Suspension/ Rear – Cast Aluminum Swing Arm, 10.6” w/ Rebound, Compression and Threaded Preload Adjustment.

Brakes/ Front – Dual Ventilated Hydraulic Disc , Twin Piston
Brake/ Rear – Ventilated Hydraulic Disc, Twin Piston

Tires/ Front – AT21x7-10 Radial
Tires/ Rear – AT20x10-9 Radial

LxWxH – 72.4”x46.1”x42.9”

Seat Height – 31.9”

Wheel Base – 50.4”

Ground Clearance – 4.4”

Fuel Capacity – 2.6 Gal

Dry Weight – 350 Lbs

Lighting – Dual 30W Krypton Multi-reflector Headlights and 3.9/0.5W LED Brake light


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