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Need help?Do you have a question about the Kawasaki KX450F - DATASHEET 2010 and is the answer not in the manual?
Details engine type, displacement, bore, stroke, compression, fuel system, ignition, transmission, and clutch.
Covers rake/trail, wheel travel, tire sizes, front and rear suspension types, and wheelbase.
Lists front/rear brakes, fuel tank capacity, ground clearance, seat height, curb mass, and colors.
Highlights the fuel injection system's benefits for easy starting and performance.
Mentions the inclusion of a new muffler for improved performance or ergonomics.
Refers to the adjustable rear suspension system for tailored ride characteristics.
Details new piston, clutch, ECU settings, and radiator improvements for 2010.
Covers updates to steering stem, fork settings, swingarm, and linkage for better handling.
Explains the 43mm throttle body, battery-less system, and automatic compression release.
Allows adjustment of fuel injection and ignition timing for custom performance tuning.
Describes the throttle linkage that provides smoother throttle application.
Details crankshaft, upright cylinder, connecting rod, and lubrication system for performance.
Focuses on lightweight titanium valves, dual springs, and DOHC camshafts.
Describes the DLC coating, twin-chamber design, and adjustable damping for optimal fork action.
Covers linkage ratios, adjustability, and Kashima Coat for improved rear suspension action.
Explains the frame's construction for rigidity, stability, and traction.
Details petal brake discs, caliper design, and brake pedal for improved braking performance.
Highlights resin skid plate, Renthal handlebar, and color scheme.
Lists available dealer-installed options like flywheels, sprockets, and DFI warning harness.
The Kawasaki KX450F is a high-performance motocross motorcycle designed for competitive off-road riding. For 2010, it features a range of updates aimed at enhancing its performance, handling, and durability, making it easier for riders to achieve fast lap times.
The KX450F is powered by a 4-stroke, liquid-cooled, DOHC, 4-valve, single-cylinder engine with digital fuel injection. This advanced fuel system ensures easy starting, sharp throttle response, and stable fuel delivery across various terrains and atmospheric conditions, eliminating the need for manual jetting adjustments. The engine's design, including a large flywheel generator, allows for a battery-less system, providing sufficient power from the initial movement of the kickstarter. Combined with a revised Automatic Compression Release, this enables easy starting with a single kick.
The motorcycle features a 5-speed transmission, optimized with gear ratios to suit a wide engine powerband. The transmission's compact design allows for a narrow frame at the rider's ankles, contributing to improved ergonomics.
The chassis is built around an aluminum perimeter frame, a combination of forged, extruded, and cast parts, designed to balance torsional and longitudinal rigidity for quick handling and stability. The frame's dimensions, including the swingarm pivot, output shaft, linkage mounts, and rear axle, are specifically placed to prevent chassis squat and improve traction under acceleration.
Suspension is handled by a Kayaba AOS (Air-Oil Separate) Cartridge Fork at the front and a Uni-Trak® rear suspension system. The front fork features Diamond-Like Carbon (DLC) coating on the inner tubes for reduced friction and improved response, while Kashima Coat on the inside of the outer tubes further enhances suspension action. The twin-chamber design of the fork maintains stable damping performance lap after lap. The Uni-Trak rear suspension linkage ratios are specifically tuned to suit the aluminum frame and swingarm, allowing for additional rear suspension travel while maintaining a low seat height. Both front and rear suspension systems offer fully-adjustable damping, allowing riders to fine-tune settings for specific track conditions and riding preferences.
Braking performance is provided by petal brake discs at both front and rear. These discs reduce unsprung weight and help clean the brake pads for more efficient braking. The front brake features a two-piston caliper with a semi-floating disc, while the rear uses a single-piston caliper. The forged aluminum rear brake pedal has a large "foot" with sharp teeth for a solid feel and easier operation in difficult conditions. An integrated rear brake fluid reservoir/master cylinder enhances reliability.
The KX450F is designed for high-performance motocross racing. Its high-performance digital fuel-injected engine offers smooth, easy-to-use power delivery, with refinements for 2010 that increase high-rpm and over-rev performance. The factory-style forged piston has a revised profile, making it lighter and stronger while improving performance across all engine speeds. The crankshaft has a slightly higher inertial mass, which helps increase traction. A revised sprocket/shaft arrangement on the intake cam moves intake valve timing forward to suit the revised engine characteristics. The new one-piece stainless steel exhaust pipe is shorter, improving midrange and top-end performance, and its reconfigured shape improves ergonomics.
The digital fuel injection system includes a progressive throttle link that opens the throttle valve slowly initially, then progressively increases the speed at which the valve opens for smoother throttle response. A 60-micron fine atomizing fuel injector, adopted from Kawasaki's Ninja ZX-10R, is mounted at a complimentary angle to the intake port to enhance mid-range power delivery.
The Kayaba AOS Cartridge Fork features bolt-on handlebar mounts with rubber dampers to reduce vibration, and these can be rotated to change handlebar position, allowing riders to customize their cockpit. The firmer seat foam is more durable and holds its shape longer, providing consistent support during long motos. Wide footpegs are located high for optimum cornering clearance, and the frame is narrow at the peg mounts for an improved riding position.
An optional user setting tool is available, allowing riders to reprogram the ECU's data maps for fuel injection volume and ignition timing. This tool enables adjustment of engine characteristics to suit individual rider preferences and can log up to six hours of data, such as rpm and throttle opening, for detailed analysis.
Several design elements of the KX450F are aimed at simplifying maintenance and enhancing durability. The radiators are thicker and wider with increased tube and fin pitch, making them stronger and better able to resist mud build-up, reducing the need for frequent cleaning and repair. The right crankcase is reinforced at the lower engine mounts for increased strength and durability.
The cylinder head features lightweight titanium valves with an oxidized membrane treatment to resist wear, ensuring long-term reliability. Dual, progressive valve springs help ensure reliable valve control and reduce cylinder head height. The lightweight, dual overhead camshafts are treated with a soft-nitriding surface treatment to reduce friction and provide reliable operation. The Automatic Compression Release (KACR) on the exhaust camshaft has increased lift for easier starting, and the screw-type automatic cam chain adjuster maintains precise valve control without requiring maintenance.
The liquid cooling system includes high-capacity Denso radiators with tightly spaced cores and a special fin design for enhanced heat dispersion. A separate oil filter/water pump cover allows for easy oil filter maintenance. The Teflon-lined clutch cable provides smooth action and clutch feel, reducing wear and requiring less frequent adjustment.
The Uni-Trak rear suspension linkage bushings are all collared sleeves for easy maintenance. The inside of the shock reservoir has friction-reducing Kashima Coat for improved suspension action and longevity.
For chassis protection, a resin skid plate extends all the way to the frame down tube, offering greater protection without the weight penalty of an aluminum skid plate. The motorcycle also features black wheels, triple clamps, and lightweight magnesium clutch, generator, and cylinder head covers, which complement the overall aesthetic while contributing to weight reduction and durability.
Optional parts are available through Kawasaki dealers to further customize and maintain the KX450F, including a manual compression release lever and cable, lighter/heavier flywheels, front and rear sprockets, a 20-inch front wheel, solid brake discs, steel spoke nipples, handlebar holders for 1-1/8" handlebars, and stiffer or softer fork and shock springs. A DFI Warning Light harness is also available for troubleshooting.
General| Displacement | 449 cc |
|---|---|
| Bore x Stroke | 96.0 x 62.1 mm |
| Compression Ratio | 12.5:1 |
| Ignition | Digital CDI |
| Transmission | 5-speed |
| Final Drive | Chain |
| Frame Type | Aluminum perimeter |
| Front Tire | 80/100-21 |
| Rear Tire | 120/80-19 |
| Rear Brake | Single 240 mm petal disc with single-piston caliper |
| Overall Width | 820 mm |
| Seat Height | 955 mm |
| Engine Type | 4-stroke single |
| Fuel System | Fuel injection |
| Front Suspension | Telescopic inverted fork |
| Rear Suspension | Uni-Trak linkage system |
| Front Brake | Single 250 mm petal disc with dual-piston caliper |
| Overall Height | 1275mm |
| Fuel Capacity | 6.2L |
| Wheelbase | 1485mm |
