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Standard Features


PROOF in Five Back-to-Back Titles

The KX™450F has been updated for 2013 to help continue its back-to-back string of recent championships. The string began with Monster Energy® Kawasaki’s Ryan Villopoto winning both the 2011 Supercross and 2011 Motocross titles, followed by leading the U.S. team to an overall victory at the Motocross of Nations, then Villopoto’s absolute domination of the Monster Energy Cup — which also earned him the Monster Million. Last but not least, Villopoto recently defended his Supercross title by winning the 2012 championship on his KX450F!


Model Year
Starting at MSRP


85.8 in.
50.2 in.
32.3 in.
248 lbs.
Ground Clearance
13 in.
58.3 in.
Seat Height
37.6 in.


4-stroke single, DOHC, 4-valve cylinder head
449 cc
Bore x Stroke
96 x 62.1 mm
Compression Ratio
Fuel System
DFI® 43 mm Keihin throttle body
Fuel Tank Capacity
1.64 gal.
Digital DC-CDI




Front: Single rigid-mount 250 mm petal disc with 2-piston caliper
Rear: Single 240 mm petal disc with 1-piston caliper
Front: 80/100-21
Rear: 120/80-19


Front: 48 mm inverted, Kayaba PSF with DLC coated sliders, 22-position compression and 20-position rebound dampening adjustment; 12.4 in. travel
Rear: UNI-TRAK® linkage system and Kayaba shock with 50 mm piston, 22-position low-speed and stepless high-speed compression dampening, 33-position rebound dampening and fully adjustable spring preload; 12.4 in. travel
4.4 in.


Lime Green

Standard Features

At a Glance…
 New Kayaba Pneumatic Spring Fork (PSF) replaces the main fork springs with compressed air to reduce weight, provide easier and more effective tuning and improve bottoming resistance  
 Revised engine tuning offers more power and smoother delivery from basement revs through mid and into the upper rpm range; this provides more thrust while exiting corners and all the way down the straights, while also enhancing rider confidence  
 Revised piston crown improves ultra-low to mid-range engine response  
 Revised intake cam features slightly less lift, to promote better low-rpm throttle response  
 New front master cylinder features a knocker-style lever-to-piston interface for improved feel and more consistent performance than the old piston-type unit  
 New longer, lower density grips make life easier on the rider’s hands; they also extend further towards the center of the handlebars, allowing riders to move their hands up to 20 mm closer together  
 New lightweight 240 mm petal-type rear rotor features the same aggressive petal style as the front rotor and is gripped by a single piston hydraulic rear caliper  
 Launch Control improves low-gear acceleration by helping to reduce wheelspin during the run to the first corner  
 Pre-programmed ignition maps are interchangeable trackside, no PC required  
 Adjustable 4-position handlebar and 2-position footpegs allow riders to fit the KX to match their personal preference  
 Black anodized aluminum rims for a factory look  
Engine Overview
 449 cc liquid-cooled, DOHC, four-stroke single with legendary Kawasaki power  
 Works-based Bridged-box Bottom piston has optimum rigidity for maximum high-rpm power and durability  
 A forward lean angle of 3° puts the engine in the ideal position for maximum traction  
 Highly balanced crankshaft, on par with Villopoto’s factory racer, creates minimal vibration and has a high inertial mass to help maximize rear wheel traction  
 Compact cylinder head is only 100 mm tall  
 Double valve springs help ensure stable valve operation and also allow for a short cylinder head height  
 Camshafts, lobes and tappet surfaces feature a soft-nitride treatment for long wear and high-rpm reliability  
 Automatic cam chain adjuster is maintenance-free  
 Crankshaft and connecting rod feature a special carburizing and quenching treatment to maximize rigidity, boosting long term reliability without adding weight  
Digital Fuel Injection
 Digital Fuel Injection (DFI®) self-adjusts to atmospheric changes for easier starting, sharper throttle response and accessible power for jumping  
 It is not necessary to re-tune, or change any jets to suit climatic conditions like carbureted models  
 Ultra-fine atomizing injector with 12 holes sprays particles with a droplet size of 60µ for smooth power delivery and engine response throughout the throttle range  
 43 mm throttle body uses a progressive throttle linkage to deliver airflow in much the same way as an FCR carburetor  
 Using two linked shafts, the throttle body opens more quickly after reaching the 3/8 open position  
 Fast-idle knob on the throttle body allows riders to increase engine speed when starting a cold engine  
 Fuel injector set at 45°, the optimum angle for mid-range power  
 Revised airbox flap helps prevent mud and water from entering, but has enlarged access hole to simplify air filter maintenance  
High-performance Multi-map ECU
 Revised ignition timing boosts response when re-opening the throttle after deceleration (when landing jumps, etc.)  
 ECU programming is easily selectable via interchangeable DFI coupler caps that provide three preprogrammed maps for Standard, Hard (terrain) and Soft (terrain), without the need for a programming computer  
 The engine can be started with only three rotations of the crankshaft using the electricity generated by a single kick of the starter, no battery needed  
 The system delivers electricity to the bike’s electronics in sequence: first the ECU, then the fuel pump, and finally the injector for quick, easy starting  
 The compact, lightweight ECU, located on the front of the steering head behind the number plate, was designed specifically for motocross use; the fuel pump relay is integrated with the ECU to help cope with the shocks and vibrations of tough racing  
Launch Control Mode
 Factory-style launch control system increases the ability to get good starts, by maximizing available traction  
 Push-button activation of the Launch Control Mode retards ignition timing in first and second gears, giving the greatest effect within the first few seconds of releasing the clutch  
 Launch Control can be activated in neutral, first or second gear  
 Shifting into third gear automatically deactivates Launch Control Mode and returns the ignition to normal mapping  
 System is designed to same specifications as factory Kawasaki AMA machines  
Easy Starting
 Strong output from the large ACG rotor provides enough electrical power for the battery-less FI system to enable true one-kick starting without using a battery  
 Equipped with an automatic compression release (ACR) system for quick and easy starting; the dual-weight centrifugal decompression system is fitted to the exhaust cam  
 Compression release features 1 mm of valve lift, to minimize the required kicking power  
Bridged-box Bottom Piston
 Revised piston crown improves ultra-low to mid-range engine response  
 Same design as used on our factory racers; offers optimum performance at all rpm  
 Lighter and more durable than traditional piston designs  
 Short piston skirt features low-friction coating to minimize mechanical losses  
 Reinforced external ribs enhance strength and durability  
PSF Front Fork
 New 48 mm KYB Pneumatic Spring Fork (PSF) eliminates the main fork springs by using compressed air as a spring; the reduced weight and inertia of the air spring improves smoothness and enhances the fork’s ability to follow terrain contours  
 Air spring significantly reduces friction and cuts weight by 1.7 lbs. per set, while also providing better bottoming resistance, less oil contamination, plus easier and more effective tuning  
 Larger 32 mm diameter internal damping cartridges allow the use of pistons with approximately twice the surface area as last year’s 24 mm AOS damper pistons; this provides more consistent performance and enhances bottoming resistance  
 A removable spring pressure adjustment valve is included to simplify connection of an air pump  
 Diamond-Like Carbon (DLC) coating on the outer surface of the inner fork tubes offers minimum stiction when the fork is exposed to lateral forces that would usually hamper slide action; the result is improved fork response, especially during cornering  
 Friction-reducing Kashima Coat on the inside of the fork’s outer tubes contributes to smooth suspension action (especially at the initial part of the stroke)  
 Wrap-around fork tube guards offer effective protection for the sliders  
 New lower triple clamp features integrated locating pins to help simplify installation and removal of the front number plate  
 New one-piece front fender attachment screws feature integrated grommets to simplify installation and removal  
Rear Shock
 New rear suspension settings have been tuned to compliment the new PSF forks  
 New 33-position rebound damping adjuster allows more precise fine-tuning of the rebound circuit  
 Easy adjuster access allows track-side suspension tuning with a minimum of hassle or lost time  
 Rear shock features dual compression adjustability, allowing 22-position high-speed and stepless low-speed damping adjustments to be made independently  
 KYB rear shock features a large 50 mm piston and a Kashima Coat treatment on the cylinder wall for reduced friction and smoother suspension action  
Aluminum Swingarm
 New swingarm features a larger front casting that extends further down the spars for maximum strength and improved rigidity  
 Tapered “D” shape swingarm is lighter than a comparable box-section unit and provides superior rigidity for its weight  
 Features tapered hydroformed spars and forged chain adjusters  
 Uni-Trak® rear suspension linkage is mounted below the swingarm to allow precise tuning and maximum rear suspension stroke  
 Optional linkage tie rod is 1 mm shorter, creating a 4 mm reduction in seat height  
Fuel Tank and Lightweight Aluminum Fuel Pump
 Compact 1.6-gallon fuel tank is formed using a blow molding process  
 Fuel pump features a one-piece filter cover and body, eliminating the need for fuel return tube from pressure regulator  
 Features a plastic fuel filter cover that wraps around the inlet port and acts as a fuel trap to help ensure a stable fuel supply during vigorous motocross riding  
Efficient Cooling
 High-capacity Denso radiators feature tightly packed cores and a fin design that deliver superior cooling efficiency  
 Shroud shape features a slim profile and large cooling outlet hole to help keep excess heat to a minimum  
 Radiator louvers feature four small blades set at a shallow angle for minimum overlap and maximum air flow  
Strong and Durable Clutch
 Clutch assembly provides a direct feel and superb control of engagement  
 Excellent oil drainage reduces power loss caused by excess oil around the clutch basket  
 Friction plates with substantial friction material contribute to fade resistance and long service life  
 Clutch case cover features embossed logo and is painted silver, making scuffs and normal wear less noticeable  
Close-ratio 5-speed Transmission
 5-speed transmission and low-rpm engine response combination offers riders more gear options for traversing rough sections or getting into the rhythm of a course easily so they can focus on racing  
 Thick first gear offers excellent durability for launching off the line in high-traction situations  
Powerful Disc Brakes
 New front master cylinder features a knocker-style lever-to-piston interface for improved feel and more consistent performance than the old piston-type unit  
 New front brake pads offer a higher coefficient of friction for stronger braking force and enhanced feel  
 New front brake hose is 30 mm longer than last year  
 Lightweight 250 mm front rotor is squeezed by a powerful twin-piston caliper and features an aggressive petal design to help clear mud and debris  
 New lightweight 240 mm petal-type rear rotor features with the same aggressive petal style as the front rotor and is gripped by a single piston hydraulic rear caliper  
Rider Interface and Styling
 New longer grips are made of lower density material and feature a taller pattern to make life easier on the rider’s hands; the new grips also extend further towards the center of the handlebars, allowing riders to move their hands up to 20 mm closer together  
 Slender frame helps the bike feel compact and nimble, but tapers to become wider near the rider’s ankles to offer optimum grip and control  
 Wide 50 mm footpegs can be adjusted to alternate position, 5 mm lower than stock  
 Dual injected 2-tone, one-piece plastic shrouds and side number plates are compact and lightweight to help mass centralization and enhance rider comfort  
 Black triple clamps and black anodized rims – just like Kawasaki’s factory teams  
 Blue finishes on suspension adjusters and engine plugs match blue accents in the graphics  
 Slim seat design uses urethane foam designed to retain its original shape and provide optimum durability  
Additional Features
 Skid plate made of resin material offers great protection without excess weight  
 Clutch cable boot features a large quick adjuster, making it easy for riders to adjust play in the clutch cable on the fly  
 Rear caliper guard helps protect the caliper from damage  
 Ribless rear hub and butted spokes offer light weight and excellent durability  


Lime Green
*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.

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*Suggested Retail Price (SRP) excludes destination charge. Visit to view applicable destination charge amount.

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