Inpage Navigation Section: Overview
With more Supercross and Motocross championships than any other manufacturer, the KX name is synonymous with winning. The KX450 motorcycle represents the flagship of the KX lineup, built with the sole purpose of dominating the track. Over the past four decades, we’ve learned what it takes to win and stay on top. Our dedication to building the ultimate machine is undeniable, and the KX450 represents this to the fullest. Featuring: 449cc 4-stroke engine with increased performance, new coned disc-spring hydraulic clutch, new Renthal Fatbar handlebar.
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Inpage Navigation Section: Features & Specs
KX FI Calibration Controller, a portable handheld calibration tool, enables riders to make changes to engine maps by plugging into the ECU without needing a PC or battery. Comes equipped with seven preset map settings.
KX FI Calibration Controller, a portable handheld calibration tool, enables riders to make changes to engine maps by plugging into the ECU without needing a PC or battery. Comes equipped with seven preset map settings.
Kawasaki’s first hydraulic clutch on a motocrosser offers more direct feel and lighter lever action.
Kawasaki’s first hydraulic clutch on a motocrosser offers more direct feel and lighter lever action.
Being able to restart an engine quickly after a spill can mean the difference between keeping your lead, or having to fight your way back through the pack.
Being able to restart an engine quickly after a spill can mean the difference between keeping your lead, or having to fight your way back through the pack.
Using the provided DFI couplers, riders can quickly and easily access their choice of three maps (standard, hard, soft) provided in the ECU.
Using the provided DFI couplers, riders can quickly and easily access their choice of three maps (standard, hard, soft) provided in the ECU.
Complementing the powerful engine, light, nimble handling contributes to the KX450’s quick lap times. While the addition of electric start and the return to a coil-spring fork add weight, efforts were made to keep the weight gain to a minimum. The result is the KX450’s leanest chassis to date, and a highly-competitive, low overall weight of only 110.0 kg.
Complementing the powerful engine, light, nimble handling contributes to the KX450’s quick lap times. While the addition of electric start and the return to a coil-spring fork add weight, efforts were made to keep the weight gain to a minimum. The result is the KX450’s leanest chassis to date, and a highly-competitive, low overall weight of only 110.0 kg.
A factory-style Ø 28.6 mm Renthal aluminium Fatbar, a popular aftermarket part, is now a standard feature.
A factory-style Ø 28.6 mm Renthal aluminium Fatbar, a popular aftermarket part, is now a standard feature.
KX FI Calibration Controller, a portable handheld calibration tool, enables riders to make changes to engine maps by plugging into the ECU without needing a PC or battery. Comes equipped with seven preset map settings.
KX FI Calibration Controller, a portable handheld calibration tool, enables riders to make changes to engine maps by plugging into the ECU without needing a PC or battery. Comes equipped with seven preset map settings.
Kawasaki’s first hydraulic clutch on a motocrosser offers more direct feel and lighter lever action.
Kawasaki’s first hydraulic clutch on a motocrosser offers more direct feel and lighter lever action.
Being able to restart an engine quickly after a spill can mean the difference between keeping your lead, or having to fight your way back through the pack.
Being able to restart an engine quickly after a spill can mean the difference between keeping your lead, or having to fight your way back through the pack.
Using the provided DFI couplers, riders can quickly and easily access their choice of three maps (standard, hard, soft) provided in the ECU.
Using the provided DFI couplers, riders can quickly and easily access their choice of three maps (standard, hard, soft) provided in the ECU.
Complementing the powerful engine, light, nimble handling contributes to the KX450’s quick lap times. While the addition of electric start and the return to a coil-spring fork add weight, efforts were made to keep the weight gain to a minimum. The result is the KX450’s leanest chassis to date, and a highly-competitive, low overall weight of only 110.0 kg.
Complementing the powerful engine, light, nimble handling contributes to the KX450’s quick lap times. While the addition of electric start and the return to a coil-spring fork add weight, efforts were made to keep the weight gain to a minimum. The result is the KX450’s leanest chassis to date, and a highly-competitive, low overall weight of only 110.0 kg.
A factory-style Ø 28.6 mm Renthal aluminium Fatbar, a popular aftermarket part, is now a standard feature.
A factory-style Ø 28.6 mm Renthal aluminium Fatbar, a popular aftermarket part, is now a standard feature.
ERGO-FIT is an interface system that allows a wide range of riders to feel at one with their machine.
Proper fit is key for rider comfort and control. However, the ideal fit varies from rider to rider, depending on their physical dimensions and riding style. ERGO-FIT is an interface system designed to allow riders to find their ideal riding position. Various points of the chassis interface (the handlebar, footpegs and seat, etc) can be adjusted through a combination of interchangeable parts and parts with adjustable positions. This enables a wide range of riders to find a riding position that offers both comfort and control. Feeling at one with their machine, they will be able to experience how Kawasaki machines are fun and rewarding to ride. *Adjustable parts and their range of adjustability vary by model.
Launch Control Mode is a motocross-use start mode that helps riders get the holeshot by minimising wheel spin off the start.
In motocross racing, getting a good start is critical. A few tenths of a second can make the difference between getting the holeshot or not. In slippery conditions, getting the maximum drive from a motocrosser requires precise control of the both the clutch and throttle. Launch Control Mode helps riders get a good start by complementing high-level technique with engine management. Featured on a mass-production motocrosser for the first time on Kawasaki's KX450F, the system activates a separate engine map designed to get a more efficient start off the line. The system is designed to the same specifications as that used by our factory racers competing in the AMA Supercross and Motocross championships. Launch Control Mode is activated simply by pressing the button on the handlebar. The Launch Control map slightly retards ignition timing to help tame the engine's strong torque and reduce wheel spin off the start. Launch Control Mode is only active in the first two gears off the start, disengaging and returning to the standard engine map automatically once the rider shifts into 3rd gear. The system gives riders a great advantage when lining up at the gate and puts them in a better position to win.
ERGO-FIT is an interface system that allows a wide range of riders to feel at one with their machine.
Proper fit is key for rider comfort and control. However, the ideal fit varies from rider to rider, depending on their physical dimensions and riding style. ERGO-FIT is an interface system designed to allow riders to find their ideal riding position. Various points of the chassis interface (the handlebar, footpegs and seat, etc) can be adjusted through a combination of interchangeable parts and parts with adjustable positions. This enables a wide range of riders to find a riding position that offers both comfort and control. Feeling at one with their machine, they will be able to experience how Kawasaki machines are fun and rewarding to ride. *Adjustable parts and their range of adjustability vary by model.
Launch Control Mode is a motocross-use start mode that helps riders get the holeshot by minimising wheel spin off the start.
In motocross racing, getting a good start is critical. A few tenths of a second can make the difference between getting the holeshot or not. In slippery conditions, getting the maximum drive from a motocrosser requires precise control of the both the clutch and throttle. Launch Control Mode helps riders get a good start by complementing high-level technique with engine management. Featured on a mass-production motocrosser for the first time on Kawasaki's KX450F, the system activates a separate engine map designed to get a more efficient start off the line. The system is designed to the same specifications as that used by our factory racers competing in the AMA Supercross and Motocross championships. Launch Control Mode is activated simply by pressing the button on the handlebar. The Launch Control map slightly retards ignition timing to help tame the engine's strong torque and reduce wheel spin off the start. Launch Control Mode is only active in the first two gears off the start, disengaging and returning to the standard engine map automatically once the rider shifts into 3rd gear. The system gives riders a great advantage when lining up at the gate and puts them in a better position to win.
Engine type | Liquid-cooled, 4-stroke, single-cylinder |
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Compression ratio | 12.5:1 |
Valve system | DOHC, 4 valves |
Bore x stroke | 96.0 x 62.1 mm |
Displacement | 449 cm³ |
Fuel system | Fuel injection: 44 mm x 1 |
Lubrication | Forced lubrication, semi‑dry sump |
Starting system | Electric |
Ignition system | Digital |
Transmission | 5-speed, return shift |
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Clutch | Wet, multi disc |
Primary reduction ratio | 2.727 (60/22) |
Gear ratios 1st | 1.750 (28/16) |
Gear ratios 2nd | 1.412 (24/17) |
Gear ratios 3rd | 1.188 (19/16) |
Gear ratios 4th | 1.000 (19/19) |
Gear ratios 5th | 0.875 (21/24) |
Final drive | Chain |
Final reduction ratio | 3.846 (50/13) |
Frame type | Perimeter, aluminium |
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Trail | 122 mm |
Wheel travel front | 305 mm |
Wheel travel rear | 307 mm |
Tyre, front | 80/100-21 51M |
Tyre, rear | 120/80-19 63M |
L x W x H | 2,185 x 820 x 1,265 mm |
Steering angle L/R | 42° / 42° |
Wheel base | 1,485 mm |
Ground clearance | 340 mm |
Fuel capacity | 6.2 litres |
Seat height | 955 mm |
Curb mass | 110.4 kg |
Front brake type | Single semi-floating petal disc |
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Front brake diameter | Ø 270 mm |
Front brake caliper type | Dual-piston |
Rear brake type | Single petal disc |
Rear brake diameter | Ø 250 mm |
Rear brake caliper type | Single-piston |
Front suspension type | Inverted fork with adjustable compression and rebound damping |
Front suspension diameter | Ø 49 mm |
Rear suspension type | Uni-Trak, adjustable dual-range (high/low-speed) compression and adjustable rebound damping, and spring preload adjustability |
Inpage Navigation Section: Accessories
Akrapovič lightweight Evolution Line full exhaust system with titanium tubes and a titanium muffler. Designed for maximum engine performance and reduced weight. The exhaust system meets FIM noise limits and features a durable welded bracket and titanium end cap.
Read MoreMade by Progrip for Kawasaki. 33 to 61mm diameter.
Read MoreWhether you want to park your bike in a pitbox or in your garage, let your precious machine rest in style on this Kawasaki Garage Mat. The mat meets new FIM environmental codes and offers a high level of absorption and dust-control features.