• Engine: Liquid-cooled, DOHC, 4-valve (titanium), single
• Displacement: 449 cc
• Bore and Stroke: 97 x 60.8 mm
• Compression Ratio: 12.8:1
• Fuel Delivery: Keihin 44mm throttle body F.I.
• Lubrication: Wet sump
• Ignition / Starting: TCI / Electric
• Transmission: 5-speed transmission: primary ratio 2.609 (60/23); secondary ratio 3.692 (48/13); 1st gear 1.929 (27/14); 2nd gear 1.533 (23/15); 3rd gear 1.300 (26/20); 4th gear 1.091 (24/22); 5th gear 0.952 (20/21)
• Final Drive: Chain
• Suspension (Front): Adj. 48mm, inverted fork / 310mm (12.2 in.) wheel travel
• Suspension (Rear): Fully adj. Monocross / 317 mm (12.5 in.) wheel travel
• Brakes (Front): 270 mm, floating disc / twin piston caliper
• Brakes (Rear): 245 mm, disc / single piston caliper
• Tires (Front): 80/100-21
• Tires (Rear): 120/80-19
• Length: 2,185 mm (86)
• Width: 825 mm (32.5 in.)
• Height: 1,285 mm (50.6 in.)
• Wheelbase: 1,485 mm (58.5 in.)
• Ground Clearance: 330 mm (13 in.)
• Seat Height: 980 mm (38.6 in.)
• Fuel Capacity: 6.2 L (1.4 Imp. gal.)
• Wet Weight: 111 kg (245 lb.)
• Colour(s): Purplish White, Yamaha Racing Blue

• New electric starting with lightweight starter motor & lithium ion battery with BMS
• New wireless smart phone based Power Tuner with expanded functions
• Revised rearward cylinder slant & engine mounts
• Revised cylinder head & compression ratio
• Revised intake & exhaust cam profiles, timing & valve springs
• New lightweight piston & revised piston pin with DLC coating
• New lightweight ACM & new ECU
• Revised air box cover & air filter
• New Mikuni FI throttle body
• Revised exhaust header & muffler mount
• Revised rads
• Revised clutch & transmission
• New frame & revised swingarm
• Revised triple clamps, fork & piggyback shock
• Revised front & rear rims
• New lightweight aluminum handle bar & new lightweight 520 drive chain
• New lighter 6.2L fuel tank, body work & flat design seat

• Revolutionary reversed engine design with front mounted FI system & rear exiting exhaust
• Mass centralizing rearward-slanted-cylinder helps keeps weight centred in the chassis
• Electric starting & lithium ion battery
• Launch Control System
• "Battery-less" 44 mm Mikuni throttle body FI & easy access air box
• Compact aluminum Bilateral Beam frame & aluminum swingarm
• Industry-leading, fully adjustable KYB® "SSS" fork & Monocross rear suspension
• 270 mm front & 245 mm rear disc brakes

• Revised, "reversed", liquid-cooled, 449 cc, DOHC, 4-valve (titanium), fuel injected, single with electric start: super convenient electric starting means faster re-starts & significantly reduced rider fatigue; compact electric starter powered by a lightweight lithium ion battery
• All new electric starting: super convenient electric starting means faster re-starts & significantly reduced rider fatigue; compact electric starter powered by a lightweight lithium ion battery
• "Reversed" engine design (FI system is front mounted, exhaust exits from rear of cylinder): FI throttle body & 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 & increases power)
• Rearward slanted, reversed cylinder design centralizes mass: 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
• Revised, 4-valve cylinder head features a new 12.8:1 compression ratio: compact combustion chamber provides optimum combustion speed while also reducing heat & power losses; 37 mm titanium intake valves & 30.5 mm titanium exhaust valves; 4-valve design offers optimum flow for excellent power & torque; intake port shape has been revised for 2018; re-located engine mounting "bosses" have been moved to the rear of the cylinder head; new aluminum upper engine mounts
• New long design electrode spark plug: moves the spark plug tip deeper into the combustion chamber; new spark plug cap holder (helps prevent plug cap from being dislodged)
• Revised high lift intake & exhaust cams & valve springs: intake & exhaust cam profiles & cam timing have been revised for increased power output; valve spring size & rates have been revised to match the revised cams; valve spring rates are optimized to reduce friction related power losses
• Lightweight titanium valves: titanium valves reduce weight & improve performance... titanium valves are 40 to 45 % lighter than steel valves; reduced valve weight improves valve train reliability & longevity; reduced reciprocating weight allows for a higher rpm limit & better control of the valves
• Automatic cam chain tensioner: reduces maintenance & mechanical engine noise; special cam chain "sliders" reduce internal frictional losses
• Lightweight, ceramic composite plated "liner-less" aluminum cylinder: reduced weight (no sleeve or heavy liner) ... plating is sprayed directly on the aluminum block; ceramic coating insures faster, more uniform heat dissipation; ceramic coating enhances the thin film of oil between the cylinder & piston, reducing friction & increasing power
• Cylinder is "offset" relative to the crankshaft (to exhaust side): reduces frictional losses between piston & cylinder wall during the power stroke
• Cylinder "cutaways" allow air "trapped" under the piston to enter a side chamber (or cutaway): reduces horsepower-robbing "pumping losses"
• Crankcase also utilizes special "cutaways": reduces horsepower-robbing "pumping losses"; crankcase cutaways match cylinder cutaways for maximum efficiency
• New, lightweight, short-skirt, forged aluminum piston & piston pin: new piston design increases the compression ratio from 12.5:1 to 12.8:1; piston weight is reduced by 6 grams & features new under side ribs for additional strength; lightweight design means faster throttle response & reduced mechanical vibration for excellent durability; New, DL (diamond like) coating on piston pin & special coating on piston skirt reduces frictional losses
• Piston oil cooler jet nozzle directs oil to the cylinder, rod & underside of piston: reduces piston, cylinder & rod temperatures for excellent durability
• Carburized connecting rod for excellent durability: carburization is a type of heat treating that adds strength & hardness
• Lightweight gear driven balancer shaft: reduces vibration for improved rider comfort & reduced rider fatigue
• Revised, heavy duty clutch with quick access magnesium outer cover & on the fly "barrel adjuster.": revised pressure plate features new reinforcing ribs for improved clutch feeling; revised clutch springs & specially machined steel plates; quick access outer cover provides fast & 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, 5-speed transmission utilizes a 2-bar, floating shift guide system & a 14 mm shift shaft: newly designed 2nd, 3rd & 4th gears are wider to match the increased engine power; floating shift guide system provides smooth, positive shifts; 14 mmm shift shaft provides good durability in the event of a crash; see spec page for gear ratios (ratios are unchanged Vs. 2017)
• New, lightweight, 44 mm Mikuni throttle body fuel injection system: 12-hole injector maximizes fuel atomization for more complete combustion & excellent power delivery; FI benefits include automatic adjustments to insure the optimum fuel — air ratio regardless of outside air temperature & altitude; other benefits include excellent throttle response & starting; cold start knob (FID) also doubles as an idle adjuster
• The injector spray pattern, spray direction and the distance to the intake valves have been optimized. Forward mounted straight intake tract helps to maximize the benefits of the FI system & overall power output: super convenient, smart phone based power tuner; no "hard" link required between the unit & smart phone... wireless signal via Wi-Fi; app is free... will work with either ISO or Android platforms; receiving communication control unit (CCU) is located under left side cover of bike; expanded adjustment range ? 16 settings for both fuel injection duration & ignition timing; new "real time" machine monitoring function (engine rpm, throttle angle, battery voltage, coolant temp, intake air temp, outside air pressure, etc.); new maintenance function ? reminds you when scheduled maintenance is required; new race log function is available to record & save settings from various tracks; tuning maps & race logs can be shared via email, Air Drop etc.
• All new, smart phone based, wire-less, "Power Tuner" with expanded functions: super convenient, smart phone based power tuner; no "hard" link required between the unit & smart phone... wireless signal via Wi-Fi; app is free... will work with either ISO or Android platforms; receiving communication control unit (CCU) is located under left side cover of bike; expanded adjustment range ? 16 settings for both fuel injection duration & ignition timing; new "real time" machine monitoring function (engine rpm, throttle angle, battery voltage, coolant temp, intake air temp, outside air pressure, etc.); new maintenance function ? reminds you when scheduled maintenance is required; new race log function is available to record & save settings from various tracks; tuning maps & race logs can be shared via email, Air Drop etc.
• Revised forward mounted air box with revised washable, dual stage foam air filter: no tools required to access air filter; new air box cover with single quick release fastener; revised washable dual stage air filter with new securing clips
• Wet sump lubrication system: reduces weight (no remote oil tank or oil lines); eases maintenance (easier & faster oil changes); oil volume is optimized to reduce oil related drag & weight
• Easy access "cartridge-type" oil filter for fast, easy oil changes: Revised, single core, dual radiators provide outstanding cooling efficiency.; core size has been increased while upper & lower tank sizes have been decreased; actual cooling area of the rads has been increased approx. 4%; mounting angle of the rads, shrouds & cooling louvers have been revised for increased air flow
• Maintenance-free transistor controlled ignition (TCI): produces a strong spark for fast starts; provides precise ignition timing / mapping for optimum engine performance at all rpms
• Revised high capacity AC magneto: smaller, lighter ACM means less engine rotational resistance
• Revised, lightweight, wrap-around exhaust system: exhaust exits from the rear of the cylinder & circles cylinder body; revised "1st stage" header has been lengthened to ensure the optimum tuned header length; maximizes exhaust "pulse effect" for excellent power delivery; centralizes mass by moving weight closer to the centre of the chassis
• Lightweight, aluminum, re-packable muffler (aka silencer): sound output is 94 dB meeting CMRC & AMA regulations; new muffler rubber mounting system reduces vibration & improves durability
• Launch control system (LCS): provides smoother, quicker starts with less wheel spin & front wheel lift; allows rider to concentrate on clutch control, body position & machine; system functions in 1st & 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 & wheelies; activation button is on the LHS handlebar & features a LED indicator light.
• Special "G" sensor system: 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

• New, compact, lightweight "Bilateral Beam" aluminum frame: new frame offers an optimum rigidity balance between strength, rigidity & tuned flex, while also providing excellent shock absorbing qualities; frame design is new with the steering head moved forward (Vs. last generation) ? resulting in a 5 mm longer wheelbase for improved traction & stability; new, top frame rails (aka. tank rails) are a straight design (Vs. last generation's slight S bend); upper engine mounts are moved rearward to provide optimized front frame rigidity & tuned flex; swingarm pivot area is wider (Vs. last generation) improving bump stability & traction
• Revised, lightweight, tapered aluminum swingarm: swingarm is slightly shorter (Vs. 2017) and 3.6% lighter; lightweight design reduces unsprung weight for optimum suspension performance; excellent rear wheel traction & control; 25mm rear axle
• Lightweight detachable rear sub frame: 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
• Revised upper & lower triple clamps: fork off set is 22 mm (Vs. 25 mm for 2017)
• New, light weight, high strength, tapered aluminum handlebar: suits wide variety of rider sizes; handle bar holders are rubber mounted for reduced vibration & improved rider comfort
• Adjustable handlebar holders offer a total of 4 different handlebar positions with an adjustment range of 30 mm (1.2"): suits wide variety of rider sizes; handle bar holders are rubber mounted for reduced vibration & improved rider comfort
• Revised, 48mm, adjustable, inverted, KYB "SSS" cartridge fork with 310mm (12.2") of wheel travel: cylinder diameter has been increased from 24 to 25 mm for improved damping; mid speed valve is changed from coil spring to "leaf spring" style; friction reducing coating on inner tubes for reduced stiction; 22 mm front axle; front fork adjustments include: compression & rebound damping, optional fork springs are available through Genuine Yamaha parts
• Fork features a twin-chamber, "Speed Sensitive System" design: damper unit is in a separate structure (completely separated air & oil chambers); helps prevent aerated fork oil from entering the inner damper assembly & degrading its damping abilities; the inner damper is pressurized, eliminating bubbles forming in the oil
• Fork also features a Transfer Control Valve (TCV): TCV enhances damping from mid to full stroke & improves bottoming characteristics; TCV offers more precise control throughout the full suspension stroke; TCV is located on the upside of the spring & 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
• Revised, Monocross link rear suspension with 317 mm (12.5") of wheel travel: fully adjustable KYB piggyback shock features a larger sub tank, new lighter spring & revised damping settings; separate adjusters for high- and low-speed compression damping; shock is in-line with the center axis of the frame for excellent control; shock adjustments include: threaded spring preload, low & high speed compression damping, & rebound damping
• 270mm floating front "wave-style" disc & compact Nissin twin piston caliper: wave disc design reduces weight & improves cooling (wave design offer more surface area for better cooling); 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 & single piston Nissin caliper: revised rear rotor for improved heat resistance; rear caliper & lower portion of the disc are protected by heavy duty plastic protectors.
• New, 6.2 litre lightweight plastic resin fuel tank: tank is positioned under the seat to reduce the centre of gravity & centralizes mass for exceptional handling & a lightweight feeling
compact in-tank electric fuel pump

NOTE: Lithium ion batteries must be charged using the correct type of charger. Yamaha recommends using only the Optimate Lithium TM291 battery charger. Do not use a high powered, lead acid charger or an automatic de-sulphating lead acid charger or serious battery damage will occur. Never use jumper cables to start the engine connected to a lead acid battery.

• New, lightweight 520 drive chain
• Extra wide foot pegs provide excellent grip
• Convenient oil level sight glass
• Folding shift lever tip helps prevent damage
• Lightweight Sun Star rear sprocket
• Heavy duty rubber swingarm protector
• Lightweight chain guide / support helps reduce chance of chain derailment & helps protect rear sprocket
• Clutch cable features integrated silicone grease & Teflon liner for smooth cable operation