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Features

All

At a glance... - All-new Launch Control Mode increases the chance of nailing the holeshot

At a glance... - New pre-programmed ignition maps, interchangeable trackside, no PC required

At a glance... - Upgraded engine with more top-end thrust and a wider powerband

At a glance... - New adjustable bar and footpeg positions

At a glance... - New slimmer frame and minimalist bodywork

At a glance... - Upgraded transmission for easy, reliable shifting

At a glance... - New pipe and silencer help centralize mass

At a glance... - 48mm AOS forks with DLC coated inner fork tubes

At a glance... - Black Alumite coated rims

Engine Overview - 449cc liquid-cooled, DOHC, four-stroke single

Engine Overview - Works-based Bridged-box Bottom piston has revised rigidity for improved high-rpm power

Engine Overview - Revised intake cam and all-new exhaust result in wider powerband

Engine Overview - A forward lean angle of 3° puts the engine in the ideal position for maximum traction

Engine Overview - Highly balanced crankshaft, on par with Villopoto’s factory racer, creates minimal vibration

Engine Overview - Maintenance-free automatic cam chain adjuster

Engine Overview - Large airbox flap helps prevent mud and water from entering

Bridged-Box Bottom Piston - Thinner top ring and revised surface treatment of oil ring reduce friction

Bridged-Box Bottom Piston - Same design as used on our factory racers; offers optimum performance at all rpm

Bridged-Box Bottom Piston - Lighter and more durable than traditional piston designs

Bridged-Box Bottom Piston - Short piston skirt features low-friction coating to minimize mechanical losses

Bridged-Box Bottom Piston - Reinforced external ribs enhance strength and durability

Cylinder Head - Compact head is only 100mm tall

Cylinder Head - Intake camshaft profile revised to increase intake for better low and mid-range power

Cylinder Head - 36mm titanium intake and 31mm exhaust valves with aluminum spring retainers minimize reciprocating weight and cylinder height to help ensure reliable valve control at high rpm

Cylinder Head - Double valve springs allow a short cylinder head height and help ensure stable valve operation

Cylinder Head - Camshafts, lobes and tappet surfaces feature a soft-nitride treatment for long wear and high-rpm reliability

Crankshaft - Crankshaft with high inertial mass helps maximize rear wheel traction

Crankshaft - 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

Crankshaft - Net result is reduced engine vibration, smoother power delivery and increased performance, with a noticeably snappier response at low rpm

Crankshaft - 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

Digital Fuel Injection - It is not necessary to re-tune, or change any jets to suit climatic conditions like on a carbureted model

Digital Fuel Injection - 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

Digital Fuel Injection - 43mm throttle body uses a progressive throttle linkage to deliver airflow in much the same way as an FCR carburetor

Digital Fuel Injection - Using two linked shafts, the throttle body opens more quickly after reaching the 3/8 open position

Digital Fuel Injection - Fast-idle knob on the throttle body allows riders to increase engine speed when starting a cold engine

Digital Fuel Injection - Fuel injector set at 45°, the optimum angle for mid-range power

Launch Control Mode - Factory-style launch control system increases chance of getting a good start by maximizing traction on a slippery surface

Launch Control Mode - 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 Mode - Launch Control can be activated in neutral, first or second gear

Launch Control Mode - Shifting into third gear deactivates Launch Control Mode and returns the ignition to normal mapping

Launch Control Mode - System is designed to same specifications as factory Kawasaki AMA machines

High Performance ECU - New ECU programming offers three preprogrammed maps: Standard, Hard (conditions) and Soft (conditions)

High Performance ECU - Maps are now easily selectable via DFI wire coupler caps, no computer necessary

High Performance ECU - 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

High Performance ECU - The system delivers electricity to FI system in sequence: first the ECU, then the fuel pump, and finally the injector for quick, easy starting

High Performance ECU - 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

Easy Starting - Revised shape of kickstart ratchet enables lever to return to start position more smoothly

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

Easy Starting - 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

Easy Starting - Compression release features 1.0mm of valve lift, to minimize the required kicking power

Lightweight Aluminum Fuel Pump - Fuel pump now features a one-piece filter cover and body, eliminating the need for fuel return tube from pressure regulator and contributing to weight reduction

Lightweight Aluminum Fuel Pump - Features a plastic (formerly 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

Lightweight Aluminum Fuel Pump - New 1.6-gallon fuel tank is formed using a blow molding process

Efficient Cooling - High-capacity Denso radiators feature tightly packed cores and a fin design that deliver superior cooling efficiency

Efficient Cooling - Changed left side radiator upper pipe angle for new shroud design

Efficient Cooling - New shroud shape features a slimmer profile and larger cooling outlet hole

Efficient Cooling - 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

Strong and Durable Clutch - Heavier clutch springs give a more positive feel to the rider

Strong and Durable Clutch - Excellent oil drainage contributes to more direct feel

Strong and Durable Clutch - Friction plates with substantial friction material contribute to a direct feel

Strong and Durable Clutch - New clutch case cover features embossed logo, designed to be revealed as rider’s boot wears away black paint

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

Close-Ratio 5-Speed Transmission - Revised number of gear dogs (3 dogs/3 holes to 4 dogs/4 holes) improve shift feel

Close-Ratio 5-Speed Transmission - Thicker first gear offers greater durability for launching off the line

Close-Ratio 5-Speed Transmission - Shorter shift fork (5.3mm to 4.4mm) reduces the shift force necessary to change gears

Close-Ratio 5-Speed Transmission - New shift lever moves the pedal 3mm farther from the footpeg and offers greater durability

Close-Ratio 5-Speed Transmission - New polyurethane resin drive chain roller reduces weight

Exhaust - New tapered header pipe is shorter in length and features a smaller overall diameter

Exhaust - Tapered mid-piece is new for 2012 KX450F

Exhaust - New silencer is 60mm shorter, but thanks to a new cross-section, features same overall volume as ’11 model to help meet current 94dB noise regulations

Powerful Disc Brakes - New front disc features an aggressive petal design

Powerful Disc Brakes - Powerful twin piston hydraulic front caliper squeezes 250mm rotor

Powerful Disc Brakes - Lightweight rigid-mounted front disc reduces unsprung weight by 80 grams

Powerful Disc Brakes - Single piston hydraulic rear caliper squeezes lightweight 240mm petal-type rotor

Light, Slim Chassis - New main frame spars are 4mm slimmer to help reduce overall width at the rider’s knees

Light, Slim Chassis - Increased rigidity in the swingarm bracket area helps increase rear wheel traction and provide a more solid feel when landing jumps

Aluminum Swingarm - Cross-section design contributes to light handling

Aluminum Swingarm - Tapered “D” shape swingarm provides ideal rigidity for excellent stability, and is lighter than a comparable box-section unit

Aluminum Swingarm - Alloy swingarm features a cast front section, tapered hydroformed spars and forged chain adjusters

Aluminum Swingarm - Uni-Trak® rear suspension linkage altered for improved traction, utilizing a revised tie-rod unit which is less rigid

Aluminum Swingarm - Suspension arm is mounted below the swingarm to allow a longer rear suspension stroke and more precise tuning

AOS Front Fork - Race-oriented suspension settings offer maximum overall performance

AOS Front Fork - Revised lower triple clamp locates the clamp opening in the rear as opposed to the side for increased rigidity and improved fork action

AOS Front Fork - Revised lower triple clamp locates the clamp opening in the rear as opposed to the side for increased rigidity and improved fork action

AOS Front Fork - 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

AOS Front Fork - 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

AOS Front Fork - 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

AOS Front Fork - Wrap-around fork tube guards offer effective protection for the sliders

Rear Shock - Rear suspension settings and linkage ratios derived from extensive rider testing

Rear Shock - Kayaba rear shock features a large 50mm piston

Rear Shock - Rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately

Rear Shock - Also features Kashima Coat treatment on the cylinder for reduced friction and smoother suspension action

Rear Shock - Easy adjuster access for track-side suspension tuning

Rider Interface and Styling - Dual injected 2-tone, one-piece plastic shrouds and side number plates minimized for mass centralization and rider comfort

Rider Interface and Styling - Upgrades bodywork features more flush seams for easier rider movement

Rider Interface and Styling - Lower-capacity fuel tank is shorter and narrower, creating a straighter line from the seat

Rider Interface and Styling - Black plastic covers, triple clamps, engine covers, and black alumite-coated rims – just like Kawasaki’s factory teams

Rider Interface and Styling - Blue alumite finish on suspension adjusters and engine plugs match new graphics accents

Rider Interface and Styling - Wide 50mm footpegs can be adjusted to alternate position, 5mm lower than stock

Rider Interface and Styling - Frame is wider at the ankles to offer optimum grip, narrows below the seat to allow a slim riding position

Rider Interface and Styling - Slim seat design uses new urethane foam designed to retain its original shape longer

Additional Features - Skid plate made of resin material offers great protection without excess weight

Additional Features - Clutch cable boot features a large quick adjuster, making it easy for riders to adjust play in the clutch cable on the fly

Additional Features - Rear caliper guard helps protect the caliper from damage

Additional Features - Ribless rear hub and butted spokes offer light weight and excellent durability

Specifications

Photos

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