Yamaha 2019 YZ450F

• super convenient electric starting means faster re-starts and significantly reduced rider fatigue
• compact electric starter powered by a lightweight lithium ion battery

• FI throttle body and air box are front mounted, providing a straight intake path
• straight shot intake path provides optimum fuel / air / exhaust flow for excellent power
• front mounted intake keeps fuel cooler since engine heat has less effect on incoming fuel (cooler fuel is more dense and increases power)

• rearward slant has been revised
• rearward slant moves a significant amount of rotating weight toward the centre of the chassis, centralizing mass for light, agile handling

• compact combustion chamber provides optimum combustion speed while also reducing heat and power losses
• 37 mm titanium intake valves and 30.5 mm titanium exhaust valves
• 4-valve design offers optimum flow for excellent power and torque

• moves the spark plug tip deeper into the combustion chamber
• new spark plug cap holder(helps prevent plug cap from being dislodged)

• intake and exhaust cam profiles and cam timing optimized for increased power output
• valve spring size and rates have been revised to match the revised cams
• valve spring rates are optimized to reduce friction related power losses

• titanium valves reduce weight and improve performance… titanium valves are 40-45 % lighter than steel valves
• reduced valve weight improves valve train reliability and longevity
• reduced reciprocating weight allows for a higher rpm limit and better control of the valves

• reduces maintenance and mechanical engine noise
• special cam chain “sliders” reduce internal frictional losses

• reduced weight (no sleeve or heavy liner) plating is sprayed directly on the aluminum block
• ceramic coating ensures faster, more uniform heat dissipation
• ceramic coating enhances the thin film of oil between the cylinder and piston, reducing friction and increasing power

• reduces frictional losses between piston and cylinder wall during the power stroke

• reduces horsepower-robbing “pumping losses”

• reduces horsepower-robbing “pumping losses”
• crankcase cutaways match cylinder cutaways for maximum efficiency

• new piston design increases the compression ratio from 12.5:1 to 12.8:1
• piston weight is reduced by 6 grams and features new under side ribs for additional strength
• lightweight design means faster throttle response and reduced mechanical vibration for excellent durability
• DLC (diamond-like coating) coating on piston pin and special coating on piston skirt reduces frictional losses

• reduces piston, cylinder and rod temperatures for excellent durability

• carburization is a type of heat treating that adds strength and hardness

• reduces vibration for improved rider comfort and reduced rider fatigue

• quick-access outer cover provides fast and easy clutch access
• light lever pull for reduced hand fatigue during a long moto
• works-style, race-spec barrel adjuster for on-the-fly clutch lever free play adjustments.

• revised pressure plate features new reinforcing ribs for improved clutch feeling
• revised clutch springs and specially machined steel plates
• quick access outer cover provides fast and easy clutch access
• light lever pull for reduced hand fatigue during a long moto
• works-style race-spec “barrel adjuster” for on-the-fly clutch lever free play adjustments.

• 2nd, 3rd and 4th gears are wider to engine power
• floating shift guide system provides smooth, positive shifts
• 14 mm shift shaft provides good durability in the event of a crash

• 12-hole injector maximizes fuel atomization for more complete combustion and excellent power delivery
• FI benefits include automatic adjustments to insure the optimum fuel andmdash; air ratio regardless of outside air temperature and altitude
• other benefits include excellent throttle response and starting
• cold start knob (FID) also doubles as an idle adjuster

• super convenient, smartphone based Power Tuner
• no “hard” link required between the unit and smartphone… wireless signal via Wi-Fi
• app is free and will work with either iOS or Android platforms
• receiving communication control unit (CCU) is located under left side cover of bike
• adjustment range includes 16 settings for both fuel injection duration and ignition timing
• real-time machine monitoring function (engine rpm, throttle angle, battery voltage, coolant temp, intake air temp, outside air pressure, etc.)
• new maintenance function allows user to track hours of use for scheduled maintenance
• race log function is available to record and save settings from various tracks
• tuning maps and race logs can be shared

• no tools required to access air filter
• new air box cover with single quick-release fastener
• revised, washable dual-stage air filter

• reduces weight (no remote oil tank or oil lines)
• eases maintenance (easier and faster oil changes)
• oil volume is optimized to reduce oil related drag and weight

• single-core, dual radiators provide outstanding cooling efficiency

• produces a strong spark for fast starts
• provides precise ignition timing / mapping for optimum engine performance at any rpms

• exhaust exits from the rear of the cylinder and circles cylinder body
• header length optimized for “pulse effect” for excellent power delivery
• centralizes mass by moving weight closer to the centre of the chassis

• sound output is 94 dB meeting CMRC and AMA regulations
• new rubber muffler-mounting system reduces vibration and improves durability

• provides smoother, quicker starts with less wheel spin and front wheel lift
• allows rider to concentrate on clutch control, body position and machine
• system functions in 1st and 2nd gears only and is disabled when the bike is shifted into 3rd
• ECU controls the system and adjusts engine rpm to limit wheel spin and wheelies
• activation button is on the LHS handlebar and features a LED indicator light.

• shuts down fuel injection system if bike lies on its side for more than 10 seconds
• helps prevent costly engine damage
• no special procedure to re-start the bike… just hit the electric start button and go!

• new frame offers an optimum rigidity balance between strength, rigidity and tuned flex, while also providing excellent shock absorbing qualities
• large upper frame bracing provides rigidity and durability
• rear frame spars and tuned engine mounts centralize mass for balance of bump absorption, stiffness and rider feeling

• lightweight design reduces unsprung weight for optimum suspension performance
• excellent rear wheel traction and control
• 25 mm rear axle

• constructed of square-section, lightweight aluminum pipe with no bends
• allows easier access when servicing rear suspension components
• detachable design reduces costs in the event of a loop out

Lightweight, high-strength, tapered aluminum handlebar.

• adjustable handlebar holders offer a total of 4 different handlebar positions with an adjustment range of 30 mm (1.2 in) suits a wide variety of rider sizes
• handle bar holders are rubber-mounted for reduced vibration and improved rider comfort
• 48 mm, adjustable, inverted, KYB “SSS” coil spring-type fork with 310 mm (12.2 in) of wheel travel.
• speed-sensitive damping provides exceptional balance between handling and bump absorption
• friction-reducing coating on inner tubes
• compression and rebound damping adjustability
• optional fork springs are available through GYPA
• helps prevent aerated fork oil from entering the inner damper assembly and degrading its damping abilities
• the inner damper is pressurized, eliminating bubbles forming in the oil
• 22 mm front axle
• Transfer Control Valve (TCV) offers more precise control throughout the full suspension stroke
• TCV is located on the upside of the spring and its function is controlled by piston speed, not piston position, hence the term “Speed Sensitive System fork.”
• Large wrap-around plastic fork protectors provide excellent lower fork tube protection.
• self-supporting design reduces friction for smoother fork operation
• KYB linkage-type rear suspension with 317 mm (12.5 in) of wheel travel.
• damping characteristics specially tuned for YZ450F chassis
• separate adjusters for high- and low-speed compression damping
• shock is in-line with the centre axis of the frame for excellent control
• adjustability includes spring preload, low and high speed compression damping, and rebound damping
• 270 mm floating front “wave-style” disc and compact Nissin twin piston caliper.
• wave disc design reduces weight and improves cooling (wave design offer more surface area for better cooling)
• aggressive brake pad material offers excellent braking performance
• “shorty-style” adjustable front brake lever can be adjusted to fit various hand sizes
• 245 mm rear disc brake features a “wave-style” disc and single piston Nissin caliper.
• heat-resistant rear rotor enhances brake durability
• rear caliper and lower portion of the disc are protected by heavy duty plastic protectors.
• 6.2-litre lightweight plastic resin fuel tank
• tank specifically designed for motocross demands
• tank is positioned under the seat to reduce centre of gravity and centralize mass for exceptional handling and a lightweight feeling

compact in-tank electric fuel pump

• Compact body work with embedded graphics
• Narrow bodywork design optimizes rider mobility and enhances the lightweight feel and look of the YZ450F
• flat design, “minimal” bodywork allows for fast, easy rider movements and a natural riding position
• minimal design aids in keeping the body work looking good longer (less plastic to scratch or damage)
• graphics are impregnated directly into the plastic rad shrouds and will not peel off or get damaged by pressure washing
• Flat design seat.
• seat is narrow in the fuel tank for ideal knee grip and easy rider movements

front of seat features a quick remove “cap cover” to access the fuel cap

• Lightweight D.I.D. front and rear rims.
• stylish blue colour emanates light design reduces unsprung weight for optimal suspension performance and handling
• excellent strength and durability due to new cross sectional rim design
• rear hub features second bearing on sprocket side for increased rigidity and durability
• Lithium ion battery.
• lightweight, compact battery and under-seat, lightweight composite battery box
• special battery management system (BMS) with “self-protection” mode both monitors and maintains battery condition
• YDT (Yamaha Diagnostic Tool) easy access, under seat coupler.
• easy access for Yamaha’s exclusive money- and time-saving diagnostic tool