First Look: 2010 Kawasaki KX Models

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KX85. Click image to jump to the photo gallery.

2010 Kawasaki KX™85

Tomorrow’s champions start here

For the growing, young rider ready to step it up to the next level or slightly older beginners looking to start racing, the Kawasaki KX™85 is a youth racer’s dream. Powered by a liquid-cooled, two-stroke, single-cylinder 84cc engine that generates race-winning power, the KX85 is packed with high-tech features such as an electrofusion-coated cylinder with a narrow squish band and large-volume combustion chamber to boost top-end power.

Its 28mm Keihin carburetor features a crescent-shaped slide, which permits positioning the needle closer to the intake ports, optimum fuel atomization and smoother fuel delivery throughout the powerband. Further enhancing the KX85’s tractable power delivery are the Kawasaki Integrated Power-valve System (KIPS®) and tuned exhaust pipe that provides better drive out of the corners and a linear power delivery for young riders of varying skill levels.

The KX85’s six-speed transmission delivers smooth and positive shifting along with enhanced durability thanks to hard chrome-finished shift fork ends, a thick base on the clutch basket housing and an additional bushing on the input shaft.

A high-tensile steel perimeter frame, with a specially designed gas tank that sits inside the frame, keeps the fuel load and center of gravity low for improved handling – yet another beneficial feature borrowed from KX85’s larger siblings.

Long-travel suspension at both ends helps to smooth out the roughest course for riders of every size and skill level. The 36mm inverted cartridge fork features 18-way compression damping adjustability, while out back, spring preload, compression and rebound damping are all adjustable on the proven UNI-TRAK® rear suspension system.

The KX85 sports a black frame that is wrapped in lime green body panels, black shrouds, new lightweight black aluminum wheels, and aggressive graphics. The end result is a factory-look racer with factory-like performance.

Those who race their KX85 at designated events are eligible to receive support from Team Green™, Kawasaki’s amateur racing support program. Each year, Team Green provides regional support vehicles and highly trained technicians at more than 100 events throughout the United States, offering technical information and assistance to those who race Kawasaki products. Kawasaki also offers a comprehensive contingency program for amateur and professional riders who place well at designated events.

Authentic Kawasaki Accessories are available through Kawasaki dealers.

Kawasaki Motors Corp., U.S.A. (KMC) markets and distributes Kawasaki motorcycles, ATVs, personal watercraft, utility vehicles and recreation utility vehicles through a network of more than 1,475 independent retailers, with an additional 8,000 retailers specializing in Kawasaki general purpose engines and hand-held power products. KMC and its affiliates employ nearly 3,300 people in the United States, with 400 of them located at KMC's Irvine, California headquarters.

Kawasaki’s tagline, “Let the good times roll.™”, is recognized worldwide. The Kawasaki brand has become synonymous with powerful, stylish motorcycles for over four decades. Information about Kawasaki’s complete line of recreational products and Kawasaki affiliates can be found on the Internet at www.kawasaki.com.

2010 Kawasaki KX™85 Features and Benefits

Liquid-cooled, Two-stroke, Single-cylinder 84cc Engine

Lightweight Electrofusion-coated cylinder improves heat transfer while resisting abrasion and seizure

Bridges between intake and exhaust ports are machine finished for less wear and improved reliability

Liquid-cooling means even-running temperatures and consistent power output

Rotor comes with rare-earth magnets – the unitized piece is small, light and more efficient with low inertial moment to improve low-rpm response

Connecting rod big-end bearing has more rigid cage for improved durability

Intake port shape and cylinder skirt allow cooling air into the crankcase chamber

Primary gear is secured using a lock-nut to help reduce mechanical noise

Metafoam gaskets for the generator and water pump covers improve sealing

Kawasaki Integrated Power Valve System (KIPS®)

KIPS system varies exhaust-port height for increased horsepower and torque at all rpm

Produces a broad powerband with more low-end torque and mid-range, while retaining excellent top-end power

Breather in KIPS cover improves high-rpm and overrun performance

Airbox

Large right-side cutout improves airflow for increased power

Reusable foam air filter

28mm Keihin PWK Carburetor

Large crescent slide positions the needle closer to intake ports for ideal fuel atomization, providing quicker throttle response and a smoother power delivery

Carburetor adjustable for various conditions

Exhaust System

Features large-diameter O-ring and groove on exhaust pipe for improved durability and easy installation

Aluminum silencer is re-packable like larger KX models

Clutch

Thick base clutch hub rides on needle bearings for smooth action

Large clutch plates are 119mm in diameter for durability and control

Clutch-release lever ratio is designed for light clutch lever action

Clutch plate service cover simplifies maintenance and utilizes a metal-carbon composite gasket

Six-speed Transmission

Positive shifting action and rugged durability

Fifth and sixth gears on the input shaft ride on bushings for added reliability

Shift forks are hard chrome finished to resist wear and seizing

Convenient oil level window

Bushings on the second, third and fourth gears on the output shaft increase durability

High-tensile Steel Perimeter Frame

Wide footpegs for better control, made of cast steel for strength

Thick footpeg mounting brackets withstand today’s rigorous tracks

Engine and chassis bolts have rust-resistant coating

Fuel Tank

Gas tank design lowers center of gravity for improved handling

UNI-TRAK® Rear Suspension

The swingarm uses large cross-section beams for improved rigidity and control

Cast-aluminum drive chain adjuster sections for easy chain adjustments

Shock is fully adjustable for compression and rebound damping and spring preload

36mm Inverted Cartridge Fork

Inverted forks are rigid, providing better steering response and control

Compression damping is 18-way adjustable

Aluminum upper fork tubes measure 49.5mm in diameter for flex-free performance

Front and Rear Disc Brakes

Front brake lever shape offers better feel

Forged-aluminum rear brake pedal is strong, lightweight and features two seals at the pivot for smooth operation and increased durability

Strong braking power is achieved with minimal effort

Front and Rear Wheels

New black coated, lightweight aluminum rims offer a factory look

Rear hub features two wheel bearings on the drive side of the hub for durability

Large rear-axle diameter for optimum rigidity

Graphics

Aggressive Kawasaki lime green and black graphics complement the black frame

Black colored lightweight aluminum wheels

2010 Kawasaki KX™85 Specifications*

Engine: Two-stroke single with KIPS®

Displacement: 84cc

Bore x stroke: 48.5 x 45.8mm

Cooling: Liquid

Carburetion: Keihin PWK28

Induction: Crankcase reed valve

Compression ratio: 10.0:1 (low speed) – 9.2:1 (high speed)

Ignition: Digital CDI

Transmission: Six-speed

Final drive: Chain

Frame: High-tensile steel perimeter design with subframe member

Rake / trail: 27 degrees / 3.5 in.

Front suspension / wheel travel: 36mm inverted telescopic cartridge fork with 18-way compression damping / 10.8 in.

Rear suspension / wheel travel: UNI-TRAK® single-shock system with 4-way compression and 16-way rebound damping, plus adjustable spring preload / 10.8 in.

Front tire: 70/100x17

Rear tire: 90/100x14

Front brake / rear brake: Hydraulic disc / Disc

Overall length: 71.7 in.

Overall width: 28.9 in.

Overall height: 41.5 in.

Ground clearance: 13.4 in.

Seat height: 33.1 in.

Curb weight: 152.1 lbs.

Fuel capacity: 1.5 gal.

Wheelbase: 49.4 in.

Color: Lime Green/Ebony

MSRP: $3,849

Wholesale distributor: Kawasaki Motors Corp., U.S.A.

9950 Jeronimo Road

Irvine, California 92618

(949) 770-0400
www.kawasaki.com

*Specifications are subject to change.

KX250F. Click image to jump to the photo gallery.

2010 Kawasaki KX™250F

Factory-style components and tuning for every racer

Kawasaki’s KX™250F motocrosser had a victorious year, winning on the track and topping its class in numerous enthusiast magazine shootouts. The successful mix of the highly rigid aluminum frame and top-shelf suspension components deliver superb high-speed stability, while its chassis geometry and high-revving engine offer excellent rear wheel traction and holeshot-winning performance. Christophe Pourcel used his new Monster Energy™/ Pro Circuit / Kawasaki KX250F to win the AMA East Supercross Lites Championship and then continued his winning ways into the outdoor season. But in the volatile world of racing, it’s a constant challenge to stay on top.

To ensure it continues its podium-topping tradition, Kawasaki fine-tuned the light handling KX250F for 2010. The engineers capitalized on its solid foundation, with refinements focused on increasing performance and longevity. The result of their labors will help the KX250F add to its ever-growing trophy collection.

Borrowing from the racing world, the KX250F gets a new piston with a bridged-box bottom – making its first appearance in a mass-production machine. The new piston is lighter and stronger. It also has a revised profile with a shorter skirt and shorter piston pin, which reduces reciprocating weight. It also features a revised crown that improves combustion. The cylinder height was raised accordingly to maintain the 13.2:1 compression ratio. Low-rpm performance was bumped up via a new longer head pipe and shorter mid-section on the new, more durable stainless steel exhaust pipe.

The 249cc, liquid-cooled, four-stroke engine received a number of other refinements for 2010, such as electrofusion treatment on the cylinder bore, revised oil pump rotors and a wider big-end bearing to increase engine life.

Its crank web design produces a crankshaft balance factor of close to 60 percent, on par with Kawasaki’s factory racers. The result is reduced engine vibration, smoother power delivery and increased performance in the mid-high rpm range. Tuned to deliver the widest possible torque band, the KX250F engine offers traction in a controllable, class-leading manner from the first crack of the throttle to wide-open at the rev limiter.

Like its bigger sibling, the KX250F received larger, stronger radiators with increased fin and tube pitch that accumulate less mud and provide more consistent cooling. With the extra strength in the new radiators, the reinforcing brackets could be dropped, helping reduce the weight of the entire radiator assembly.

Transmission durability was also raised inside and out. Building upon the achievements of last year, Kawasaki engineers put larger dogs on the third and fourth input gears to help prevent wear, and revised the fourth input gear holding method by eliminating a circlip and washer and changing the shape of the second input gear to reduce thrust clearance. On the outside, the new KX250F crankcases are stronger and thicker with increased material around the engine mount holes. The transmission action and feedback are optimized with its ratchet drive shift mechanism and integrated clutch cable holder into the crankcase.

With its lightweight construction blend of forged, extruded and cast parts, the KX250F’s slim aluminum perimeter frame has the chassis balance and settings race-experienced riders seek. The center of gravity and locations of key items such as the swingarm pivot, output sprocket and rear axle were positioned to best channel the drive from the rear tire into forward acceleration.

For 2010, chassis improvements are primarily focused on delivering sharper cornering performance and an optimized front-to-rear balance for improved suspension composure. To achieve this balance, the race-oriented suspension settings were revised for a more balanced – less forward-leaning – chassis posture when riding. A new steering stem with lower rigidity helps lighten handling, while also providing smoother fork action and better impact absorption.

These revisions refine the stable damping performance of the KX250F’s Showa twin-chamber fork during long motos and work in conjunction with the updated swingarm, which features a modified cross-section with thinner wall thickness and narrower internal ribs. The Showa rear shock’s new damping settings provide greater stability and less “kicking” on corner entry. New Uni-Trak rear suspension linkage ratios match these new rear shock damping characteristics.

Designed with rider ergonomics in mind, the KX250F bodywork offers riders a slim interface and a natural positioning that make it easier to go fast. The sleek bodywork components include one-piece, dual injected, two-tone black and green plastic shrouds and side number plates. The shrouds were fine-tuned to fit the new radiators while retaining their slender form. For 2010, a thicker and more rigid front fender graces the KX250F. The slim, rider friendly seat with a non-slip top surface and smooth sides provides excellent seated grip and rider mobility, and gets firmer urethane foam to hold its shape longer.

Chassis protection is grade-A for 2010, and helps sustain the KX’s durability factor. Examples include the large, resin skid plate, the rear caliper guard and the narrow, long-lasting chain guide, all of which offer protection without high weight.

The rest of the KX250F is equally impressive, with premium-quality Renthal aluminum handlebars included as standard equipment along with black triple clamps, engine covers and hubs. The new black alumite coated lightweight aluminum wheels feature a revised cross section that offers both increased strength and lighter weight, and the ribless rear hub and butted spokes further reduce unsprung weight. Factory-style graphics finish off the package and complement the KX250F’s stellar on-track performance.

Racers who ride their KX250F at designated events are eligible to receive support from Team Green™, Kawasaki’s amateur racing support program. Each year, Team Green provides regional support vehicles and highly trained technicians at more than 100 events throughout the United States, offering technical information and assistance to those who race Kawasaki products. Kawasaki also offers a comprehensive contingency program for amateur and professional riders who place well at designated events.

Authentic Kawasaki Accessories are available through Kawasaki dealers.

2010 Kawasaki KX™250F Features and Benefits

At a glance…

Increased engine performance and durability

First mass-production use of a high-performance piston featuring a bridged-box bottom

Durable stainless steel exhaust

Quicker-turning chassis

Chassis balance and suspension settings aimed at race-experienced riders

Higher Performing, High-Revving Engine

249cc, liquid-cooled, four-stroke, four-valve, single-cylinder DOHC engine delivers hard-hitting power from mid- to high-rpm

Engine tuned to achieve the widest possible torque band, so that traction efficiency is maximized through a greater percentage of the rev range

Race-experienced riders will be able to harness its high-rpm performance that extends way into the over-rev

Sprocket-style chain drive roller helps reduce the effect of driveline lash and engine braking for smoother and faster corner entries

Hot start system permits quick starting when the engine is hot; the hot start lever is unitized within the clutch lever assembly, reducing handlebar clutter

Crank web design increases offsetting moment for a high crankshaft balance factor with the balance factor on par with the factory racers; resulting in reduced engine vibration, smoother power delivery and increased performance in the mid-high rpm range

New Piston

New lighter, stronger piston shares the same design as the factory racers, with a revised profile with a shorter skirt, reinforced external ribs and the first mass-production use of a bridged-box bottom, featuring fully flush internal bracing

Shorter piston pin reduces reciprocating weight

Through a revised piston crown, combustion is improved and cylinder height was increased accordingly to maintain compression ratio at 13.2:1

Lightweight and Efficient Top End

Lightweight, highly rigid, titanium 31mm intake and 25mm exhaust valves reduce reciprocating weight and offer greater high-rpm reliability

The ultra-light valves have extremely thin valve stems on par with those found in supersport machines with the intake valves featuring thicker heads for increased strength

Intake ports designed for peak performance at all rpm, especially in the high-rpm range

Special coating applied to the intake port cores during the casting process gives the intake ports extremely smooth surfaces and optimum intake efficiency across the rev range

Cam chain tensioner spring reduces mechanical loss by approximately 30 percent

Increased auto-decompressor spring preload on the exhaust cam for easier starting

Silicon coated head gasket provides excellent sealing

Enhanced Durability and Reliability

Electrofusion treatment on cylinder bore improves surface oil retention and the molybdenum coating on the cylinder bore surface helps resist scorching, further contributing to durability

Big-end bearing widened from 18 to 19mm; it features a thicker copper plating on its cage and a longer crank pin for increased reliability

Revised oil pump rotors offer increased reliability and durability; a larger feed pump rotor size increases oil flow, while a smaller scavenge pump rotor reduces mechanical loss

New Stainless Steel Exhaust Pipe

New stainless steel construction features a revised shape and extra durability

Revised joint between the exhaust pipe and muffler for improved sealing and increased durability gained by using a rubber damper collar on the rear silencer mount

Longer head and shorter mid section on the tapered exhaust pipe for increased low-rpm performance

Silencer meets 99dB AMA noise regulations

Stronger Cooling

New 10mm thicker and 4mm wider radiators have increased fin and tube pitch, are stronger, offer improved resistance to mud build-up and provide better cooling performance

The stronger radiators mean the reinforcing brackets could be eliminated and overall weight reduced

Cylinder head water jacket routes coolant via the front of the cylinder head for even cooling

Increased Shifting Reliability

The third and fourth input gears have larger dogs to help prevent wear, while a revised fourth input gear holding method (by eliminating a circlip and washer and changing the shape of the second input gear) reduces thrust clearance

New stronger crankcases feature additional material around the engine mounts and help increase long-term durability

Ratchet drive shift mechanism provides good shift feel and transmission durability

The clutch cable holder is integrated with the crankcase for improved feel at the clutch lever

Scavenge oil filter screen can be accessed without splitting the crankcases, facilitating easier maintenance

Quicker-Turning Chassis

Utilizes a new steering stem with lower rigidity for lighter handling

The KX250F’s slim and lightweight aluminum perimeter frame construction is composed of forged, extruded and cast parts

Center of gravity and key dimensions such as swingarm pivot, output sprocket and rear axle locations designed to increase forward drive with minimal rear-end squat

Upper engine mounts on sides of the head cover, increasing rigidity

Race-Oriented Suspension

Revised race-oriented suspension settings optimized front/rear balance, resulting in a flatter (less forward-leaning) chassis posture when riding

Further, revised damping settings and a less rigid steering stem offer improved action (smoother) and increased absorption performance.

Showa twin-chamber fork keeps oil and air in separate chambers for stable damping performance during long motos

Super-hard titanium coating on the outer surface of the inner fork tubes reduces stiction and improves suspension action. The increased surface hardness of the dark navy blue coating also helps prevent scratches and damage to the tubes

Friction-reducing Kashima Coat on the inside of the outer fork tubes contributes to smoother suspension action, especially during the initial part of the stroke

Wrap-around black fork tube guards provide greater protection for the inner tubes

Revised shock damping settings offer increased absorption performance and greater stability on corner entry thanks to reduced rear-end kicking

Features Kashima Coat on the tank cylinder for reduced friction and smoother suspension action

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

Superior Rear-Wheel Traction

Swingarm features a revised cross-section, wall thickness and internal ribs for improved cornering performance, enabling lighter turn-in and tighter cornering

Alloy swingarm uses a cast front section, tapered hydroformed spars and forged chain adjusters

Uni-Trak® rear suspension system mounts the suspension arm below the swingarm, allowing a longer rear suspension stroke and more precise tuning

Revised linkage ratios for the new Uni-Trak rear suspension to match new rear shock damping settings to achieve maximum rear wheel traction

Rider Interface

Designed with rider ergonomics in mind, bodywork components offer the rider a slim interface, the natural position making it even easier for racers to go fast

Formed using a double-injection molding process, the 2-tone shrouds were fine-tuned to accommodate the new radiators, and feature a slightly slimmer design

Side number plates also 2-toned and contribute to the slim package

Right side panel has an added passageway to aid in cooling the silencer

Frame is wider at the ankles to offer better grip and narrows near the bend below the seat to allow a slim riding position

Slim seat features firmer urethane which keeps its original shape longer

Seat has a slip-resistant top surface for good grip when seated and smooth sides for excellent rider mobility

50mm wide (front-to-rear) footpegs designed to offer grip and superb feel at the pegs

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

Throttle grip has a one-piece collar that provides additional stability during throttle operation

Lightweight short-length grips feature a pattern designed to provide excellent grip

Factory-Style Components

New rim design with revised cross section offers both increased strength and lighter weight

Rims are coated in black alumite – just like the factory racers

New thicker and more rigid front fender

Revised rear brake pad material offers stronger braking performance

Front and rear petal disc brakes help reduce unsprung weight, and the wave shape helps clean the brake pads for more efficient braking performance

Rear caliper guard protects the caliper from damage

Ribless rear hub and butted spokes further reduce unsprung weight

Renthal aluminum handlebar is standard equipment.

Factory-style graphics complement the KX250F’s highly tuned performance and black plastic covers, triple clamps, number plates, and engine covers

Additional Features

Large front brake lever boot offers increased protection against debris

Slim and compact 34mm wide chain guide, utilizes a thick wear pad for longer life

Large resin skid plate offers great protection with minimum weight

New chain with thinner inner links provides 20g in weight savings

Optional Parts

Optional engine parts include magneto rotors with different inertias and a 12-tooth output sprocket

Optional chassis parts include handlebar holder for a 1 1/8-inch handlebar, 46 to 50-tooth aluminum and steel rear sprockets, solid petal brake rotors, different fork and shock springs and manual decompression lever and cable

2010 Kawasaki KX™250F Specifications*
Engine: Four-stroke single with DOHC and four valves

Displacement: 249cc

Bore x stroke: 77.0 x 53.6mm

Cooling: Liquid

Carburetion: Keihin FCR37 and hot start circuit

Compression ratio: 13.2:1

Ignition: Digital CDI with K-TRIC throttle position sensor

Transmission: Five-speed with wet multi-disc manual clutch

Final drive: Chain

Frame: Aluminum perimeter

Rake / trail: 27.4 degrees / 4.7 in.

Front suspension / wheel travel: 47mm inverted Showa twin-chamber telescopic fork with 16-way compression and rebound damping / 12.4 in.

Rear suspension / wheel travel: UNI-TRAK® linkage system and Showa shock with 13-way low-speed and stepless high-speed compression damping, 17-way rebound damping and fully adjustable spring preload / 12.2 in.

Front tire: 80/100-21

Rear tire: 100/90-19

Front brake: Single semi-floating 250mm petal disc with dual piston caliper

Rear brake: Single 240mm petal disc with single-piston caliper

Overall length: 85.4 in.

Overall width: 32.3 in.

Overall height: 50.0 in.

Wheelbase: 57.9 in.

Ground clearance: 13.4 in.

Seat height: 37.6 in.

Curb weight: 231.4 Lbs.

Fuel capacity: 2.1 Gal.

Color: Lime Green

MSRP: $6,999

Wholesale distributor: Kawasaki Motors Corp., U.S.A.

9950 Jeronimo Road

Irvine, California 92618

(949) 770-0400
www.kawasaki.com

*Specifications are subject to change.

KX450F. Click image to jump to the photo gallery.

2010 KAWASAKI KX™450F

Fuel-injected perfection for demanding riders

The 2010 Kawasaki KX™450F provides an ideal platform for riders looking to win races. Its precise aluminum frame, premium suspension components and expert-tuned settings are designed to deliver superb high-speed stability, enabling racers to capitalize on its amazing engine performance. Holeshot acceleration is delivered by a strong powerband and optimized chassis geometry specifically engineered to maximize rear wheel traction. Monster Energy™ Kawasaki rider Ryan Villopoto used his new KX450F to win several AMA Supercross and Motocross races, during his first year on a 450.

The KX450F features a number of engine refinements, including the first mass-production use of a high-performance bridged-box bottom piston that offers more power in the high and over-rev rpm ranges. Revised cam timing and ECU settings provide better mid-high rpm performance, while reinforcements to the cylinder sleeve and right side crankcase increase durability.

The race-ready engine is compact and light, with a short 100mm cylinder head and a 12.5:1 compression ratio. A wedge-shaped crank web offsets 60% of the crankshaft’s reciprocating weight, producing an effective “counterweight” effect. This is on par with Kawasaki’s factory racers and helps reduce engine vibration, smooth power delivery and enhance low-rpm throttle response. A new 40mm shorter stainless steel exhaust pipe connects to a large-volume silencer which uses long-fiber packing material to maximize service intervals. A new rubber damping collar in the rear silencer mount provides a boost to long-term durability.

The KX450F’s Digital Fuel Injection (DFI) automatically adjusts to suit track and climate conditions, and offers stable fuel-metering, even when landing from jumps in tough motocross conditions. The DFI system includes a compact and lightweight ECU, a 43 mm throttle body, a lightweight aluminum in-tank fuel pump and an ultra-fine atomizing injector. Set at a 45° angle for ideal mid-range power, the 12-hole injector sprays precise, 60-micron fuel particles for smooth power delivery and accurate engine response throughout the rpm range.

Designed specifically for motocross, the KX450F’s lightweight DFI system doesn’t require a battery; the engine can be started within three rotations of the crankshaft, using only the electricity generated through the initial stroke of the kickstarter. A new ECU program with revised settings offers improved engine response at low-mid rpm.

An optional ECU Setting Tool allows racers to select from several different ECU data maps, or fine-tune a custom map that alters fuel injection and ignition timing to suit different tracks and conditions. 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.

The engine’s phenomenal power is delivered through a new clutch that features a lighter operating plate with improved oil drainage and new friction plates with 75% more friction material than last year’s unit. The entire assembly is designed to provide improved clutch feel and enhanced durability. A new final drive chain features thinner inner links and a 20 gram weight savings to help boost acceleration.

Chassis updates focus on making the KX450F even easier to ride fast. A new steering stem shaft and revised suspension tuning provide lighter handling, improved suspension action, increased comfort and greater cushioning when landing from jumps.

The 2010 KX450F’s D-shaped aluminum swingarm features a revised cross section with narrower ribs and thinner walls. It pivots high in the aluminum frame to maximize rear wheel traction. Mounting the arm of the Uni-Trak® rear suspension linkage below the swingarm provides a long rear suspension stroke and facilitates precise shock tuning.

Complementing the responsive chassis with settings optimized for experienced racers, the KX450F’s suspension offers a host of features for precise cornering and sharp handling. For 2010, the Kayaba Air-Oil-Separate (AOS) fork receives revised spring rate and damping settings working in conjunction with a less rigid steering stem to offer improved action and increased comfort during the initial phase of the suspension stroke. The fork features a Diamond-Like Carbon (DLC) coating on the outer surface of the inner fork tubes to minimize stiction when the fork is exposed to lateral forces that would otherwise hamper slide action. The result is smooth and precise fork response, especially during cornering. The overall suspension action is extremely smooth due to a friction-reducing Kashima Coat treatment on the inside surfaces of the outer fork tubes and the rear shock reservoir. Black wrap-around guards provide excellent protection for the fork sliders.

The 2010 KX450F’s Kayaba rear shock received new spring rate and damping settings which contribute to increased stability and improved impact performance when landing jumps. It features a large 50mm piston and a Kashima Coat treatment on the shock internals to help maintain a plush feel throughout the toughest motos. Easily accessible dual compression adjusters allow high- and low-speed damping to be tuned separately, giving mechanics and riders the ability to easily fine-tune the suspension for difficult track conditions.

New 10mm-thicker and 7.6mm-wider radiators feature increased fin and tube pitch for increased strength and better resistance to mud build-up. The extra strength of the new radiators allowed the reinforcing brackets to be eliminated, resulting in lower overall weight. New one-piece, dual injected, two-tone green and black plastic shrouds accommodate larger new radiators while still providing slim ergonomics.

A slim seat design with firm urethane foam, a non-slip top surface and smooth sides provides good seated grip and excellent rider mobility. The frame echoes the slim profile at the top, but widens at the lower end by the ankles to provide the rider with better feel and control. Completing the rider interface are wide 50mm footpegs that offer tenacious grip and a comfortable platform.

The 2010 KX450F is available in Kawasaki lime green, with black alumite-coated rims and aggressive graphics for a factory appearance.

Racers who ride their KX450F at designated events are eligible to receive support from Team Green™, Kawasaki’s amateur racing support program. Each year, Team Green provides regional support vehicles and highly trained technicians at more than 100 events throughout the United States, offering technical information and assistance to those who race Kawasaki products. Kawasaki also offers a comprehensive contingency program for amateur and professional riders who place well at designated events.

Kawasaki Motors Corp., U.S.A. (KMC) markets and distributes Kawasaki motorcycles, ATVs, personal watercraft, utility vehicles and recreation utility vehicles through a network of more than 1,475 independent retailers, with an additional 8,000 retailers specializing in Kawasaki power products and general purpose engines. KMC and its affiliates employ nearly 3,300 people in the United States, with 400 of them located at KMC's Irvine, California headquarters.

2010 Kawasaki KX™450F Features and Benefits

At a glance…

More Powerful Engine

Revised Suspension Settings

Refined Fuel Injection

Still Super-Easy to Start!

Engine Overview

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

Cylinder skirt strengthened to handle increased engine performance

Right-side crankcase reinforced at lower engine mount for increased strength and durability

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

Tuned for a broad powerband with the torque curve set just under the wheel spin threshold

High-acceleration cams help the engine rev quickly

Maintenance free screw-type automatic cam chain adjuster

Large flap inside the airbox helps prevent the ingress of mud and water

New Bridged-Box Bottom Piston

First mass-production use of a bridged-box bottom piston design

Same design as used on our factory racers, offers improved performance at all rpm

7 grams lighter than the ’09 piston

6mm shorter piston skirt features a 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

Shorter piston pin has a smaller inner diameter for increased strength

Cylinder Head

New intake camshaft features a revised sprocket/shaft arrangement which advances intake valve timing by two degrees, to suit revised engine characteristics

Compact head is only 100mm tall

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

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

New crankshaft with a slightly higher inertial mass helps boost rear wheel traction

Wedge-shaped crank web provides enough offsetting moment for a 60 percent balance factor – this is similar to the crank balance in Kawasaki’s factory race engines

End result is 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 power stability when jumping/landing

Ultra-fine atomizing injector with 12 holes sprays particles with a droplet size of 60μ for smooth power deliver and smooth engine response throughout the throttle range

43mm 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°, the optimum angle for mid-range power

High performance ECU

New ECU programming and revised settings offer improved response at low-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

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

Fuel return hose from the pressure regulator helps ensure there is always fuel in the inlet port, preventing stalls due to fuel splashing and enabling riders to use all the fuel

1.8 gallon fuel tank is formed using a rotational molding process

Optional 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 preference – it is not necessary to re-tune, no changing needle jets to suit climatic conditions like on a carbureted model

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.

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 1.0mm of valve lift, to minimize the required kicking power

Better Cooling

New radiators are 10mm taller and 7.6mm wider, with increased fin and tube pitch to provide a extra strength and better resistance to mud build-up

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

Because the new radiators are stronger, reinforcing brackets could be eliminated, resulting in lower overall weight

New shrouds feature a slightly slimmer design that is fine-tuned to accommodate the new radiators

Radiator louvers feature four small blades set at a shallow angle, for minimum overlap and maximum air flow

Improved Clutch

New clutch provides a more direct feel and increased control

Material trimmed from the spring holders and outer surface of the plate, to optimize rigidity and improve oil drainage, contributing to more direct feel

Friction plates feature approximately 75% more friction material, contributing to a more direct feel

Operating plate pusher features an increased outer diameter, to reduce 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

New chain with thinner inner links offers 20g weight savings

Sprocket-style chain drive roller reduces the effect of driveline lash, helping smooth engine braking and facilitating additional corner entry control

Exhaust

One-piece stainless steel exhaust pipe is 40mm shorter than the ’09 unit, contributing to improved mid-high rpm performance

Optimized exhaust routing contributes to improved ergonomics

High volume silencer body helps meet noise regulations - currently 99dB

Right side panel has special passageway to help cool the silencer

Powerful Disc Brakes

Revised rear brake pad material offers stronger braking performance

Powerful twin piston hydraulic front caliper

Lightweight semi-floating 250mm petal type front brake rotor

Single piston hydraulic rear caliper squeezes lightweight 240mm petal type rotor

Light, Slim Chassis

New steering stem shaft with lower rigidity contributes to lighter handling

Main frame spars are 68mm tall and 24mm wide, to provide an ideal balance between stiffness and compliance

Weight saving features include a slim head pipe, narrow cross section and a down tube that is now formed with a swaging (squeezing and hammering) process

Swingarm pivot is located high in the frame to maximize rear wheel traction

Aluminum Swingarm

Revised cross-section contributes to lighter 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

Revised Uni-Trak® rear suspension linkage ratio increases 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 over-all performance

Revised spring rate and damping settings work with the less rigid steering stem to 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 outer tubes contributes to smooth suspension action (especially at the initial part of the stroke) and a superb ride feel

Wrap around black fork tube guards offer effective protection for the inner fork tubes

Rear Shock

New spring rate and damping settings contribute to increased stability and improved impact performance when landing jumps

Rear suspension settings and linkage ratios derived from extensive rider testing

Kayaba rear shock features a large 50mm 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 2-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 50mm foot pegs 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 which 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 smooth sides for excellent rider mobility

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 while on the fly

Rear caliper guard helps protect the caliper from damage

Ribless rear hub and butted spokes offer light weight and excellent durability

2010 Kawasaki KX™450F Specifications*

Engine: Liquid-cooled, four-stroke single with DOHC and four valve cylinder head

Displacement: 449cc

Bore x stroke: 96.0 x 62.1mm

Compression ratio: 12.5:1

Fuel Injection: 43mm Keihin Throttle body

Ignition: Digital DC-CDI

Transmission: Five-speed

Rake / trail: 26.7 degrees / 4.6 in.

Front suspension / wheel travel: 48mm inverted, Kayaba AOS with DLC coated sliders, 22-position compression and 20-position rebound dampening adjustment / 12.4 in.

Rear suspension / wheel travel: UNI-TRAK® linkage system and Kayaba shock with 50mm piston, 22-position low-speed and stepless high-speed compression dampening, 22-position rebound dampening and fully adjustable spring preload / 12.4 in.

Front tire: 90/100-21

Rear tire: 120/80-19

Front brake: Single semi-floating 250mm petal disc with dual piston caliper

Rear brake: Single 240mm petal disc with single-piston caliper

Overall length: 86.0 in.

Overall width: 32.3 in.

Overall height: 50.4 in.

Wheelbase: 58.3 in.

Ground clearance: 13.4 in.

Seat height: 38.0 in.

Curb weight: 250.4 lbs.

Fuel capacity: 1.9 gal.

Color: Lime Green

MSRP: $8,049