2014 Yamaha YZ450F

Posted on by  

The Yamaha YZ450F has received a complete makeover for 2014. The new motorcycle comes with a long list of style and technical upgrades which make it better, lighter and stronger than the previous generation.

One of the most important upgrades made to the Yamaha YZ450F is the all-new aluminum Bilateral Beam frame that is rigid enough to offer a stable ride but also light enough to not feel heavy during high jumps.

The motorcycle’s handling is also enhanced by the reworked suspensions and the new steering head pipe position which was moved 10mm closer to the rider.

However, the big news here is the new EFI, liquid-cooled, DOHC, 4-stroke, 449.7cc engine. The 2014 unit features revised piston, intake and exhaust valves, ports, valve mechanism, ignition timing, and fuel injection mapping so you can expect to first class performances throughout the power band.

Hit the jump for more information on the Yamaha YZ450F.

Overview

Yamaha YZ450F

The all new 2014 YZ450F. Featuring a new EFI engine, an entirely new frame, minimized body work and new suspension components providing for excellent mass centralization and class leading 450 power with 250-style handling.

  • YZ450F’s revolutionary rearward-slanted-cylinder design is an innovative approach to achieve unmatched mass centralization. Concentrating the motorcycle’s heaviest components (engine mass, fuel tank, exhaust system, and airbox) toward the center of the machine helps achieve superior, nimble handling.
  • The 4-titanium-valve cylinder head is matched to a newly recalibrated fuel injection system to provide superb power feeling across the rpm range. The adjustable fuel injection system uses a 44mm throttle body fed by a high pressure battery-less electric pump to ensure optimum fuel atomization and air/fuel calibration for excellent readability in a wide range of riding conditions. The YZ450F instantly adapts to changing air/fuel mixtures depending on altitude and temperature, for an engine that delivers no matter what conditions.
  • The new aluminum Bilateral Beam frame offers a superb rigidity balance and, with new settings to already class leading front and rear suspension, provides unmatched lightweight handling and cornering. For 2014, the steering head pipe is moved 10mm closer to the rider, making for a more compact chassis dimension and placing more weight bias on the front wheel which translates to an even more precise and instinctive handling character.
  • Accessory GYTR® Power Tuner lets owners adjust air/fuel mixture and ignition timing maps to match engine performance characteristics to the rider and track conditions in a matter of seconds with the push of a few buttons.

Engine

Yamaha YZ450F
  • For 2014, the top-end... Piston, intake and exhaust valves, ports, valve mechanism, ignition timing, and fuel injection mapping have all been meticulously revised, resulting in improved combustion and outstanding engine performance throughout the power band, with a focus on controllability.
  • The new high-performance ECU provides great bottom end torque plus delivers a strong feeling of power from 3rd gear up while new gear ratios also lengthen the powerband and heighten the feeling of power in 2nd and 3rd gear.
  • The valve mechanisms and cylinder head feature new specs that take performance to the next level. Intake and exhaust valves are enlarged and the cam profile for the intake has been modified, all contributing to improved combustion, resulting in added power and outstanding performance.
  • The exhaust pipe has an innovative layout, circling the cylinder, giving the exhaust pipe proper length for an excellent exhaust pulse effect. At the same time, the exhaust pipe has three different diameters throughout the exhaust tract, bringing out excellent power characteristics. This new layout allows the silencer to be positioned 186mm further forward behind the side panel, closer to the middle of the bike which centralizes the mass for superior handling.
  • The compact wet sump lubrication system with piston cooler spray jet eliminates the need for an oil tank, reducing engine weight. The water pump employs a plastic resin impeller for further weight reduction. The reduced size of the crankcase enabled by this lubrication system design is a major factor in making it possible to mount the 450cc engine on the newly designed compact frame to deliver precise and instinctive handling.
  • Newly designed transmission and shift mechanisms provide quicker, smoother shifting under power with less effort.
  • The accessory GYTR Power Tuner can simplify the work of adjusting fuel injection volume and ignition timing settings to fit personal preferences or track conditions.

Chassis/Suspension

Yamaha YZ450F
  • A newly designed aluminum Bilateral Beam frame is adopted in which the head pipe is moved 10mm closer to the rider. The overall dimensions are roughly the same as the frame of the 2013 YZ250F. This gives the YZ450F a new compact chassis that provides the most instinctive handling in the 450 motocross class.
  • The aluminum muffler is positioned closer to the machine’s center of gravity as it is almost completely hidden by the side number plate. The layout allows a shorter, lighter sub frame and also contributes to mass centralization for lightweight handling feel.
  • The front suspension has proven KYB® air-oil separated forks. It adopts new spec inner and outer tubes coupled with optimized suspension settings. The new rear suspension also features a new reservoir location and spring spec with settings optimized for ideal damping characteristics to match the new chassis dimensions.
  • The new larger diameter 22mm front axle and new top triple clamp increase rigidity for improved handling and front end feel. The handlebar mounts are now rubber mounted to improve comfort and reduce handlebar vibration.
  • A new layout for the fuel tank and air cleaner box gives the machine a slimmer feeling between the legs as well as positions fuel tank mass closer to the center of the bike which improves handling feel. Furthermore, the air box can now be accessed without removing the fuel tank for easy serviceability of the new larger air cleaner element.
  • A new narrower radiator design contributes to slimming down the radiator panel area.

Additional Features

Yamaha YZ450F
  • “In-mold graphics” technology is a method in which the graphics are molded into the radiator shrouds for improved decal durability and reduced scratches.
  • Riders have a choice of two color options: Team Yamaha Blue/ White or White/Red.

Specifications

Yamaha YZ450F
Engine typeLiquid-cooled DOHC 4-stroke; 4 titanium valves
Displacement449.7cc
Bore x Stroke97.0 x 60.8mm
Compression Ratio12.5:1
Fuel DeliveryYamaha Fuel Injection (YFI), Keihin® 44mm
IgnitionTCI
TransmissionConstant-mesh 5-speed; multiplate wet clutch
Final DriveChain Drive
Suspension / FrontKYB® Speed-Sensitive System, inverted fork: fully adjustable, 12.2-in travel
Suspension / RearKYB® Fully adjustable single shock; 12.4-in travel
Brakes / FrontHydraulic single disc brake, 250mm
Brakes / RearHydraulic single disc brake, 245mm
Tires / Front80/100-21 Dunlop® MX51-FA
Tires / Rear120/80-19 Dunlop® MX51
Length85.6 in
Width32.5 in
Height50.8 in
Seat Height38.4 in
Wheelbase58.3 in
Ground Clearance13.2 in
Fuel Capacity2.0 gal
Wet Weight***245 lb
Warranty30 Day (Limited Factory Warranty)
Price*$8,490

* Price and Specifications subject to change without notice. Please read your Owner’s Manual and all labels before operation.

** Fuel economy estimates are based on US EPA exhaust emission certification data obtained by Yamaha. Your actual mileage will vary depending on road conditions, how you ride and maintain your, vechile, accessories, cargo and operator/passenger weight.

*** Wet weight includes the vechile with all standart 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 comparisions with other models.

Verdict

Yamaha YZ450F

The Yamaha YZ450F was already a very capable dirt bike but the 2014 version raises the bar even higher. All changes done to the new YZ450F are without a doubt very important, but the most interesting modification is the new engine.

Yamaha’s engineers have spent a lot of time to make this unit more powerful, but the main idea was increase its power without affecting the bike’s maneuverability. Therefore apart from the improved engine, the motorcycle also needed additional tweaks such as reworked suspensions, a new exhaust system, a fresh frame and better brakes.

The end result is quite impressive as the motorcycle feels lighter, faster and is able to reward you with an agile riding experience regardless of what type of terrain lies under its wheels.

In the end, Yamaha did a great job with its 2014 YZ450F. The company’s technicians managed to improve the faults of the previous generation without completely changing the motorcycle’s personality.


What is your take?

Back to top