Yamaha ATV Yfz450 2004

• 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 componentsincluding the swingarm, upper A-arms, oil tank, grab bars and wheelshelp 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.