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Standard Features


Did Somebody Say Motor

In the 450 cubic centimeter motocross game, the only thing that matters to serious racers is top-tier performance and running up front. And for 2011, the best tool for the job is once again a lime green one – Kawasaki’s reworked and revised KX™ 450F. In this arena you can’t stand still technically, which is why Kawasaki engineers scrutinized every system and component of the race-winning 2010 model and came up with a host of tweaks that’ll have red, blue, orange and yellow wondering what hit ’em.


Model Year
Starting at MSRP


86 in.
50.4 in.
32.3 in.
249.9 lbs.
Ground Clearance
13.2 in.
58.3 in.
Seat Height
37.8 in.


4-stroke single, DOHC, 4-valves
449 cc
Bore x Stroke
96 x 62.1 mm
Compression Ratio
Fuel System
43 mm Keihin throttle body
Fuel Tank Capacity
1.9 gal.
Digital DC-CDI




Front: Single semi-floating 250 mm petal disc with 2-piston caliper
Rear: Single 240 mm petal disc with 1-piston caliper
Front: 90/100-21
Rear: 120/80-19


Front & Rear: UNI-TRAK® linkage system and Kayaba shock with 50 mm piston, 22-position low-speed and stepless high-speed compression damping, 33-position rebound dampening and fully adjustable spring preload; 12.4 in. travel
4.6 in.


Lime Green

Standard Features

Engine Overview
 449 cc, liquid-cooled, DOHC, four-stroke single  
 Bridged-box bottom piston design offers optimal engine performance  
 Reinforced crankcase is strong and durable  
 A forward lean angle of 3 degrees puts the engine in the ideal position for maximum traction  
 Tuned for a broad powerband with the torque curve set just under the wheelspin threshold  
 High-acceleration cams help the engine rev quickly  
 Maintenance-free automatic cam chain adjuster  
 Large airbox flap helps prevent mud and water from entering  
Bridged-box Bottom Piston
 Same design as used on our factory racers; offers improved performance at all rpm  
 Lighter and more durable than traditional piston designs  
 Short piston skirt features low-friction coating for reduced mechanical losses  
 Reinforced external ribs for strength and durability  
 Revised profile with fully flush internal bracing results in a lighter, stronger piston  
 Short piston pin offers increased strength  
Cylinder Head
 Compact head is only 100 mm tall  
 36 mm titanium intake and 31 mm exhaust valves with aluminum spring retainers minimize reciprocating weight and cylinder height to help ensure reliable valve control at high rpm  
 Double valve springs allow a short cylinder head height and help ensure stable valve operation  
 Camshafts, lobes and tappet surfaces feature a soft-nitride treatment for long wear and high-rpm reliability  
 Crankshaft with high inertial mass helps maximize rear wheel traction  
 Wedge-shaped crank web provides enough offsetting moment for a 60 percent balance factor – and is similar to the crank balance in Kawasaki’s factory race engines, resulting in reduced engine vibration, smoother power delivery and increased performance, with a noticeably snappier response at low rpm  
 Crankshaft and connecting rod feature a special carburizing and quenching treatment to maximize rigidity  
Digital Fuel Injection
 Self-adjusts to atmospheric changes for easier starting, sharper throttle response and optimized power and stability when jumping / landing  
 It is not necessary to re-tune, or change any jets to suit climatic conditions like on a carbureted model  
 Ultra-fine atomizing injector with 10 holes sprays particles with a droplet size of 60 microns 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  
 Lightweight throttle body is approximately half the weight of a FCR carburetor, saving over one pound in weight  
 Fast-idle knob on the throttle body allows riders to increase engine speed when starting a cold engine  
 Fuel injector set at 45 degrees, the optimum angle for mid-range power  
High Performance ECU
 New ECU programming and revised settings offer improved response at low-to-mid rpm  
 No battery needed; the engine can be started with only three rotations of the crankshaft using the electricity generated by a single kick of the starter  
 The system delivers electricity to FI system in sequence: first the ECU, then the fuel pump, and finally the injector for quick, easy starting  
 Starting can be accomplished in a single kick  
 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 motocross riding.  
Lightweight Aluminum Fuel Pump
 Located in the fuel tank but at a new angle to help prevent damage in extremely rough riding conditions  
 Features a rubber 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  
 1.9-gallon fuel tank is formed using a rotational molding process  
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  
Efficient Cooling
 High-capacity Denso radiators feature tightly packed cores and a fin design that delivers superior cooling efficiency  
 Radiators don’t need reinforcing brackets, which results in lower overall weight  
 Shrouds feature a slim design that melds with the radiators’ design  
 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  
 Excellent oil drainage contributes to more direct feel  
 Friction plates with substantial friction material contribute to a more direct feel  
 Large operating plate pusher reduces the clearance between the pusher and the input shaft hole, improving clutch operation  
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 more on racing  
 Thinner inner-link chain is light and strong  
 Sprocket-style chain drive roller reduces the effect of driveline lash, helping smooth engine braking and facilitating additional corner entry control  
 Short, one-piece stainless steel exhaust pipe contributes to optimum mid-high rpm performance  
 Optimized exhaust routing contributes to improved ergonomics  
 High-volume silencer helps meet noise regulations currently 94 dB  
 Right side panel has special passageway to help cool the silencer  
Powerful Disc Brakes
 Rear brake pad material offers strong braking performance  
 Powerful twin-piston hydraulic front caliper  
 Lightweight semi-floating 250 mm petal-type front brake rotor  
 Single piston hydraulic rear caliper squeezes lightweight 240 mm petal-type rotor  
Light, Slim Chassis
 Revised engine mount brackets optimize frame rigidity for better handling  
 Lightweight steering stem shaft contributes to light, nimble handling  
 Main frame spars are 68 mm tall and 24 mm wide to provide an ideal balance between stiffness and compliance  
 Weight-saving features include a slim head pipe, narrow cross-section and a downtube formed with a swaging (squeezing and hammering) process  
 Swingarm pivot is located high in the frame to maximize rear wheel traction  
Aluminum Swingarm
 Cross-section design contributes to light handling  
 Tapered "D" shape swingarm provides ideal rigidity for excellent stability, and is lighter than a comparable box-section unit  
 Alloy swingarm features a cast front section, tapered hydroformed spars and forged chain adjusters  
 Uni-Trak® rear suspension linkage ratio maximizes rear traction performance  
 Suspension arm is mounted below the swingarm to allow a longer rear suspension stroke and more precise tuning  
Front Fork
 Race-oriented suspension settings offer maximum overall performance  
 Revised damping settings offer improved action and increased comfort during the initial phase of the suspension stroke  
 Kayaba Air-Oil-Separate (AOS) fork keeps oil and air in separate chambers for stable damping performance during long motos. Low-friction fork seals contribute to smooth action.  
 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) and a superb ride feel  
 Wrap-around fork tube guards offer effective protection for the sliders  
Rear Shock
 New damping settings contribute to increased stability and improved impact performance when landing from jumps  
 Rear suspension settings and linkage ratios derived from extensive rider testing  
 Kayaba rear shock features a large 50 mm piston  
 Rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately  
 Also features Kashima coat treatment on the cylinder for reduced friction and smoother suspension action  
 Easy adjuster access for track-side suspension tuning  
Rider Interface and Styling
 Dual injected two-tone, one-piece plastic shrouds and side number plates  
 Optimized exhaust routing contributes to improved ergonomics  
 Right side panel has special passageway to help cool the silencer  
 Black plastic covers, triple clamps, engine covers, and Black alumite-coated rims – just like Kawasaki’s factory teams  
 Wide 50 mm footpegs provide excellent feel and a comfortable platform  
 Frame is wider at the ankles to offer optimum grip, narrows below the seat to allow a slim riding position  
 Slim seat design uses firmer urethane foam that keeps its original shape longer for the best possible ergonomics and feel  
 Seat has a slip-resistant top surface for good grip when seated and a new material along the sides for extra grip when standing  
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  
 Increased front axle collar diameter transmits more feedback from the contact patch to the rider  
 Ribless rear hub and butted spokes offer light weight and excellent durability  
 Rear caliper guard helps protect the caliper from damage  


 User ECU Setting Tool
 Allows racers to reprogram the ECU’s data maps for volume of fuel injected and ignition timing to alter engine characteristics to suit rider preferences  
 The tool can also be used as a data logger, recording up to six hours of data, including engine rpm, degree of throttle opening, engine boost, coolant temp, air temp, ignition timing, fuel adjustments, gear position and system voltage  


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.

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

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