2011 Yamaha YZ450F (discontinued)

2011 Yamaha YZ450F  2011 Yamaha YZ450F
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Product Yamaha YZ450F
Model Year 2011
Engine Size 450cc
Engine Type Liquid-cooled DOHC Four-Stroke; 4 titanium valves
Engine Displacement 449cc
Bore x Stroke 97.0 x 60.8mm
Compression Ratio 12.5:1
Fuel System Yamaha Fuel Injection (YFI), Keihin® 44mm
Ignition CDI
Transmission Constant-mesh 5-speed; multiplate wet clutch
Final Drive
Suspension Front KYB® Speed-Sensitive System, inverted fork: fully adjustable, 12.2-in travel
Suspension Rear KYB® Fully adjustable single shock; 12.4-in travel
Brakes Front Hydraulic single disc brake, 250mm
Brakes Rear Hydraulic single disc brake, 245mm
Tires Front 80/100-21-Dunlop® D-742FA
Tires Rear 120/80-19-Dunlop® D-756
Overall Length 86.3 in
Overall Width 32.4 in
Overall Height 51.6 in
Seat Height 39.3 in
Wheelbase 58.7 in
Ground Clearance 15.0 in
Fuel Capacity 1.63 gal
Curb Weight 245 lb

New For 2011:

• New clutch lever and pushrod for more consistent clutch feel during long motos.


• The rearward-slanted engine allowed engineers to design straight intake and exhaust ports, creating the most direct path for air flow into the fuel-injected engine for incredible performance.
• The YZ450F uses a battery-less fuel injection system with a 12-hole injector for superb fuel atomization. The 44mm Keihin® throttle body is designed for easy starting, with an integrated cold start and idle speed adjustment knob. Yamaha FI provides optimal air/fuel mixtures in all altitudes and wide range of temperatures for outstanding throttle response.
• 14 volt / 110W high output generator powers the battery less fuel injection system.
• 4-titanium valve cylinder head with a “pent-roof” design combustion chamber provides excellent combustion efficiency and unequalled power output.
• Intake and exhaust camshaft profile changes to increase valve working angle and valve lift for most excellent performance at all rpm.
• The bigger 97.0mm bore and shorter 60.8mm stroke, along with a higher 12.5:1 compression ratio, create a combustion chamber that delivers really impressive power.
• The air filter case is changed to accommodate the engine layout. Putting it up front keeps dirt and dust kicked up from the rear tire away from the intake system.
• “Tornado-style” exhaust header with resonator efficiently scavenges exhaust gasses and helps the engine achieve its exceptional low-to-mid range torque characteristics, while the 150mm-longer muffler comfortably meets the latest noise standards without a sacrifice of power.
• Clutch and transmission components have been designed to give the rider great shifting feel.


• The aluminum Bilateral Beam frame is crafted from a carefully chosen combination of forged and extruded aluminum, 16 components in all, for the right rigidity balance and light weight. A very symmetrical chassis design promotes nimble handling, letting riders enter and exit corners as quickly as possible to put the competition behind them.
• Skid plate is constructed from tough polypropylene for great protection and low weight.
• The swingarm and rear shock are redesigned, with the shock mounted along the central axis of the frame, taking advantage of the space no longer needed for the front-mounted airbox. This optimized combination delivers exceptionally linear performance for excellent bump absorption and awesome cornering ability.
• The KYB® Speed Sensitive front fork has excellent feel and shock absorption.
• KYB® rear shock with large capacity piggy back reservoir and 50mm piston for more consistent damping control.
• Fuel tank is positioned underneath the seat, contributing to the centralized mass. The seat is long and flat for to allow free rider movement.
• Rear sprocket shape has a trick appearance and is light weight.
• The triple clamps are designed, with a change in offset from 25 to 22 mm for unequalled cornering performance. The ProTaper® bars are four-way adjustable to accommodate a wide range of riders.
• The front and rear fenders, along with the number plate, side cover and front fork protector have been designed for an aggressive look. A minimalistic design is used to accentuate the handling character of the bike. Less plastic is used to expose and enhance the lightweight aluminum frame.

Additional Features:

• Fuel pump is small and lightweight, as is the compact transistor ignition unit.
• Riders have a choice of two color options: Team Yamaha Blue and White or White and Red.

Available Accessories:

Please refer to the Yamaha Accessories & Apparel Catalog or go to yamaha-motor.com.
* Wet weight includes the vehicle with all standard equipment and all fluids, including oil, coolant (as applicable) and a full tank of fuel. It does not include the weight of options or accessories. Wet weight is useful in making real-world comparisons with other models.

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