Standard Features
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Own the track.

Featuring a "reversed" rear slanted engine design for mass centralization, minimal bodywork and a proven KYB "SSS" suspension system, the YZ450F offers class leading power in a 250 sized chassis. The YZ450F balances the three essential elements of an ultimate motocrosser: easy cornering, lightweight and compactness and a deep, useable power band.


Model Year
YZ450F Purplish White
Purplish White


85.8 in. (2,180 mm)
50.4 in. (1,280 mm)
32.5 in. (825 mm)
247 lbs. (112 kg) wet
Ground Clearance
13 in. (330 mm)
58.3 in. (1,480 mm)
Seat Height
38 in. (965 mm)


4-stroke, DOHC, 4-valve (titanium), single
450 cc
Bore x Stroke
97 x 60.8 mm
Compression Ratio
Fuel System
Keihin 44 mm throttle body fuel injection
Fuel Tank Capacity
1.7 imp. gal. (7.5 l)
TCI (Transistor Controlled Ignition)
Wet sump


Final Drive
Gear Ratio
1st: 27/14 = 1.929
2nd: 23/15 = 1.533
3rd: 26/20 = 1.300
4th: 24/22 = 1.091
5th: 20/21 = 0.952


Front: 270 mm floating disc / twin-piston caliper
Rear: 245 mm disc / single-piston caliper
Front: 80/100-21
Rear: 120/80-19


Front: Adjustable 48 mm inverted fork; 12.2 in. (310 mm) travel
Rear: Fully adjustable Monocross; 12.4 in. (315 mm) travel

Standard Features

Key Improvements for 2017
 Revised air filter cover & fasteners  
 Revised rear wave-style brake rotor  
 New tire tread pattern front & rear  
Key Features
 Revolutionary reversed engine design with front mounted FI system & rear exiting exhaust  
 Mass centralizing rearward-slanted-cylinder helps keeps weight centred in the chassis  
 Launch Control System  
 "Battery-less" 44 mm throttle body FI & easy access airbox  
 Compact aluminum Bilateral Beam frame & aluminum swingarm  
 Industry-leading, fully adjustable KYB® "SSS" fork & Monocross rear suspension  
 Large 270 mm front disc brake & twin piston caliper  
 GYTR® Power Tuner Ready  
 Design goals for the YZ450F are a balance of easy cornering, a lightweight & compact feeling due to excellent mass centralization and a deep power band tuned for excellent "ride-ability & controllability".  
 "Reversed" liquid-cooled, 450 cc, DOHC, 4-valve (titanium), 4-stroke, single with fuel injection.  
 Rearward slanted, reversed cylinder design.  
    Rearward slant moves a significant amount of rotating weight toward the centre of the chassis  
    Rearward slanted design centralizes mass for excellent handling & a light feel  
 "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 intake path into the cylinder, provides optimum fuel / air 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)  
    Design centralizes mass for light, agile handling  
 Compact 4-valve cylinder head features a 12.5:1 compression ratio.  
    37 mm titanium intake valves & 30.5 mm titanium exhaust valves  
    4-valve design offers optimum flow for excellent power & torque  
    Compact combustion chamber design  
 Lightweight, hollow intake & exhaust cams.  
    Excellent power & controllability in the low to mid rpm range  
    Strong high rpm power  
 Lightweight titanium valves use load-reduced oval valve springs.  
    Titanium reduces reciprocating weight & allows for a higher rpm limit (40% lighter than steel valves)  
    Reduced friction (load reduced) valve springs  
 Automatic cam chain tensioner.  
    Reduces maintenance & mechanical engine noise  
    Special cam chain "sliders" reduce internal frictional losses  
 Lightweight, ceramic composite plated 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  
    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  
 Lightweight, short-skirt, forged aluminum piston.  
    Lightweight design means faster throttle response  
    Reduced mechanical vibration for excellent durability  
    Special coating on piston skirt reduces friction  
 Piston oil cooler jet nozzle directs oil to the cylinder, rod & underside of piston.  
    Reduces piston, cylinder & rod temperatures for excellent durability  
 Carburized (type of heat treatment) connecting rod for excellent durability.  
 Lightweight gear driven balancer shaft.  
    Reduces vibration for improved rider comfort & reduces rider fatigue  
 5-speed transmission utilizes a 2-bar, floating shift guide system & a 14 mm shift shaft.  
    Smooth, positive shifts  
    Good durability in the event of a crash (14 mm shift shaft)  
 Heavy duty, multi-plate, clutch with quick access magnesium outer cover.  
    Quick access outer cover provides fast & easy clutch access  
    Light lever pull for reduced hand fatigue  
 44mm Keihin 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 starting & excellent throttle response  
    Cold start knob 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  
 Optional, compact, hand held "GYTR Power Tuner" allows tailoring of both fuel injection duration & ignition mapping.  
    9- different setting points can be accessed for both fuel duration & ignition maps  
    Maps can be stored & shared with other Power Tuners if desired  
    Easy access GYTR Power Tuner connector port  
 Revised forward mounted air box with washable, dual stage foam air filter.  
    No tools required to access air filter  
    New air box cover & new quick release fastners  
    Washable design reduces maintenance costs  
 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.  
 Compact, lightweight, single core, dual radiators provide outstanding cooling efficiency.  
 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  
 High capacity AC magneto to power the FI system.  
 Lightweight, wrap-around exhaust system.  
    Exhaust exits from the rear of the cylinder & circles cylinder body  
    Design ensures 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).  
    Revised muffler bracket reduces weight  
    Sound output is 94 db meeting CMRC & AMA regulations  
 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 as soon as the bike is shifted into 3rd gear  
    ECU controls the system and adjusts 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 kick it and go  
 Works-style race-spec "barrel adjuster" for on-the-fly clutch lever free play adjustments.  
Chassis / Suspension
 Compact, lightweight "Bilateral Beam" aluminum frame.  
    Centralizes mass for exceptional handling & manoeuvrability  
    Frame offers an optimum rigidity balance between strength, rigidity & tuned flex, plus excellent shock absorbing qualities  
    Frame design offers excellent "rider - machine communication" (a.k.a. Feedback)  
    Key goal of the chassis is fast & easy cornering ... One of the main keys to winning races  
 Lightweight, tapered aluminum swingarm.  
    Lightweight design reduces unsprung weight for optimum suspension performance  
    Excellent rear wheel traction & control  
    25 mm rear axle  
 Lightweight detachable rear sub frame.  
    Constructed of square-section, lightweight aluminum pipe with no bends  
    Allows easy access when servicing rear suspension components  
    Detachable design reduces costs in the event of a loop out  
 Adjustable handlebar holders offer a total of 4 different handlebar positions with an adjustment range of 30 mm.  
    Suits wide variety of rider sizes  
    Handlebar holders are rubber mounted for reduced vibration & improved rider comfort  
 48mm, adjustable, inverted, Kayaba "SSS" cartridge fork with 310 mm (12.2 in.) of wheel travel.  
    Front fork adjustments include: 20-way compression damping & 20-way rebound damping  
    Inner tubes feature a special friction reducing coating  
    22 mm front axle  
    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  
    Since the inner damper is pressurized, it also eliminates 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  
 Monocross link rear suspension with 315 mm (12.4 in.) of wheel travel.  
    Features a fully adjustable Kayaba piggyback shock  
    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, 20-way low-speed compression damping, 2 turns of high speed compression damping & 30-way rebound damping  
 270 mm 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 & master cylinder.  
    Revised rear motor for improved heat resistance  
 Rear caliper & lower portion of the wave disc are protected by heavy duty plastic protectors.  
 Lightweight, plastic resin 7.5 litre fuel tank  
    Reduces centre of gravity & centralizes mass for exceptional handling & a lightweight feeling  
    Tank can be flipped on its back without disconnecting fuel line (easy servicing under the tank)  
    Compact in-tank electric fuel pump  
 Compact body work.  
    Reduces weight & enhances the lightweight feel and look of the YZ450F  
    Flat design, "minimal" bodywork allows for fast, easy rider movements & a natural riding position  
    Minimal design aids in keeping the body looking good (less plastic to scratch or damage)  
    Graphics are impregnated directly into the plastic rad shrouds & will not peel off or get damaged by pressure washing  
 Flat seat design.  
    Provides easy rider movements  
    Features a "cap cover" to access the fuel cap  
    Non-slip seat cover material resists clogging with dirt or mud  
 Rugged Excel rims.  
    Excellent durability  
    Reduces unsprung weight for optimal suspension performance & handling  
    Front rim size is 1.60 x 21 in., rear is 2.15 x 19 in.  
    Hub features second bearing on sprocket side for increased rigidity & durability  
 Extra wide foot pegs provide excellent grip  
 Convenient oil level sight glass  
 Folding shift lever tip helps prevent damage  
 Heavy duty DID 520 chain  
 Lightweight Sun Star 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  
 Easy access GYTR Power Tuner & Yamaha Diagnostic tool connectors  

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