2021 Kawasaki KX 450
2021 Kawasaki KX 450

Specs

General Information

Manufacturer
Kawasaki
Kawasaki
Model Year
2021
2021
Model
KX 450
KX 450
Model Code
KX450JMFNN
KX450JMFNN
Color
Lime Green
Lime Green

Brakes/Wheels/Tires

Brakes

Front - Single semi-floating 270 mm Braking® petal disc with dual-piston caliper

Rear - Single 250 mm Braking® petal disc with single-piston caliper

Front - Single semi-floating 270 mm Braking® petal disc with dual-piston caliper

Rear - Single 250 mm Braking® petal disc with single-piston caliper

Tires

Front - 80 / 100-21

Rear - 120 / 80-19

Front - 80 / 100-21

Rear - 120 / 80-19

Dimensions

Length
Overall - 86 in.
Overall - 86 in.
Height
Overall - 49.8 in.
Overall - 49.8 in.
Width
Overall - 32.3 in.
Overall - 32.3 in.
Weight

Curb without fuel- 232.7 lb.

Curb - 242.9 lb.** (Curb weight includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent capacity) and tool kit (if supplied))

Curb without fuel- 232.7 lb.

Curb - 242.9 lb.** (Curb weight includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90 percent capacity) and tool kit (if supplied))

Ground Clearance
13.4 in.
13.4 in.
Wheelbase
58.5 in.
58.5 in.
Seat Height
37.6 in.
37.6 in.

Drivetrain

Transmission
5-speed, return shift, with wet multi-disc manual clutch and hydraulic clutch actuation
5-speed, return shift, with wet multi-disc manual clutch and hydraulic clutch actuation
Final Drive
Chain
Chain

Engine

Engine
4-stroke single, DOHC
4-stroke single, DOHC
Cooling
Liquid
Liquid
Displacement
449 cc
449 cc
Bore x Stroke
96 x 62.1 mm
96 x 62.1 mm
Compression Ratio
12.5:1
12.5:1
Fuel System
DFI® with 44 mm Keihin throttle body
DFI® with 44 mm Keihin throttle body
Ignition
Digital CDI
Digital CDI
Starting
Electric
Electric
Fuel Capacity
1.64 gal.
1.64 gal.

Operational

Frame
Aluminum perimeter
Aluminum perimeter
Front Suspension

49 mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping

Travel - 12 in.

49 mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping

Travel - 12 in.

Rear Suspension

Uni-Trak® gas charged shock with piggyback reservoir with dual-range (4 turns stepless high speed / 19-way low-speed) compression damping, 22-way rebound damping and adjustable preload

Travel - 12.1 in.

Uni-Trak® gas charged shock with piggyback reservoir with dual-range (4 turns stepless high speed / 19-way low-speed) compression damping, 22-way rebound damping and adjustable preload

Travel - 12.1 in.

Rake
27.6°
27.6°
Trail
4.8 in.
4.8 in.

Features

Chassis & Ergonomics

  • MADE TO SHAVE LAP TIMES: Experience the race-winning advantage of a strong and lightweight chassis, agile handling, and exclusive ERGO-FIT® technology.
  • BALANCE MEETS PRECISION: A lightweight aluminum perimeter frame and swingarm provide overall rigidity balance, contributing to precise cornering. Front-end feel is predictable and maximum traction is gained at the rear wheel.
  • GET A GRIP: Wide footpegs ensure excellent grip for optimum comfort and control, and make it easier to weight the pegs.
  • PERFECT FIT: Find your best performance with the Kawasaki ERGO-FIT® advantage. Four handlebar positions and two footpeg positions allow you to tailor the KX™450 motorcycle to your body size, riding style and preference.
  • NEW RENTHAL® FATBAR® HANDLEBAR: A factory-style aluminum Renthal® Fatbar® handlebar comes standard, offering reduced vibration. With grips positioned lower and closer to the body, riders can shift weight forward more easily to improve front wheel traction, and increase front traction feel, to ride more confidently at the limit.

Next-Level Technology

  • RIDE WITH CONFIDENCE: From quick, reliable starting to advanced braking power, the KX™450 motorcycle offers superior features designed to inspire confidence. What's more, this race-ready machine is backed by decades of championship-proven experience.
  • ADVANCED STOPPING POWER: Next-level stopping power matches incredible acceleration capability. Up front, an oversized 270mm Braking® petal disc with dual-piston caliper offers sharp response and a strong, consistent feel. In the rear, a large-diameter 250mm Braking® petal disc complements the front for race-ready performance.
  • RELIABLE STARTING: Being able to restart your engine quickly after a stall can make or break a race. Powered by a compact and lightweight Li-ion battery and supported by an automatic centrifugal decompression system, all it takes is the push of a button to start up
  • LIGHT PULL & SELF-ADJUSTING: A new coned disc-spring hydraulic clutch offers lighter clutch pull and a wider engagement range. Larger diameter plates provide increased fade resistance.

Power & Performance

  • BUILT TO WIN: The 2021 KX™450 engine offers increased performance and delivers broad, useable torque and strong, responsive power across the rev range. From the starting gate to the finish line, this race-ready machine is built to stay ahead of the pack.
  • POWER THROUGH THE FINISH: The powerful 449cc engine features new friction reduction coating on the piston for increased engine performance.
  • EVERY SECOND COUNTS: A factory-style launch control system helps put the bike’s power to the ground for maximum acceleration at the start of the race, making the holeshot yours for the taking.
  • PULL AHEAD: A flat torque curve makes it easier to get on the gas sooner, delivering smooth and powerful acceleration to pass the competition and keep you ahead of the pack.
  • FINELY TUNED POWER: Use the DFI® couplers to choose engine settings to suit your riding style or track conditions. This plug-and-play style system allows quick and easy selection from three pre-programmed fuel injection and ignition mapping settings. Fine tune your ECU setting with factory precision. The KX™ FI Calibration Kit* features a handheld controller that enables adjustment of fuel mapping and allows storage of presets without a PC. *Sold separately as a Kawasaki Genuine Accessory

Race-Ready Suspension

  • LEAVE THEM IN THE DUST: Take the lead with proven race-winning performance. The highly adjustable suspension package delivers smooth action, firm damping and contributes to optimal traction.
  • RACE READY: The 49mm Showa Coil Spring Front Fork combined with A-KIT Technology deliver excellent handling. Large-diameter inner tubes allow the use of large damping pistons for race-winning performance while a large-diameter front axle provides exceptional front-wheel traction.
  • CHAMPIONSHIP PROVEN: The Uni-Trak® rear suspension system features adjustable dual-range (high- and low-speed) compression damping, adjustable rebound damping, and adjustable preload. The result is optimal damping and rear-wheel traction.

Chassis & Ergonomics

  • MADE TO SHAVE LAP TIMES: Experience the race-winning advantage of a strong and lightweight chassis, agile handling, and exclusive ERGO-FIT® technology.
  • BALANCE MEETS PRECISION: A lightweight aluminum perimeter frame and swingarm provide overall rigidity balance, contributing to precise cornering. Front-end feel is predictable and maximum traction is gained at the rear wheel.
  • GET A GRIP: Wide footpegs ensure excellent grip for optimum comfort and control, and make it easier to weight the pegs.
  • PERFECT FIT: Find your best performance with the Kawasaki ERGO-FIT® advantage. Four handlebar positions and two footpeg positions allow you to tailor the KX™450 motorcycle to your body size, riding style and preference.
  • NEW RENTHAL® FATBAR® HANDLEBAR: A factory-style aluminum Renthal® Fatbar® handlebar comes standard, offering reduced vibration. With grips positioned lower and closer to the body, riders can shift weight forward more easily to improve front wheel traction, and increase front traction feel, to ride more confidently at the limit.

Next-Level Technology

  • RIDE WITH CONFIDENCE: From quick, reliable starting to advanced braking power, the KX™450 motorcycle offers superior features designed to inspire confidence. What's more, this race-ready machine is backed by decades of championship-proven experience.
  • ADVANCED STOPPING POWER: Next-level stopping power matches incredible acceleration capability. Up front, an oversized 270mm Braking® petal disc with dual-piston caliper offers sharp response and a strong, consistent feel. In the rear, a large-diameter 250mm Braking® petal disc complements the front for race-ready performance.
  • RELIABLE STARTING: Being able to restart your engine quickly after a stall can make or break a race. Powered by a compact and lightweight Li-ion battery and supported by an automatic centrifugal decompression system, all it takes is the push of a button to start up
  • LIGHT PULL & SELF-ADJUSTING: A new coned disc-spring hydraulic clutch offers lighter clutch pull and a wider engagement range. Larger diameter plates provide increased fade resistance.

Power & Performance

  • BUILT TO WIN: The 2021 KX™450 engine offers increased performance and delivers broad, useable torque and strong, responsive power across the rev range. From the starting gate to the finish line, this race-ready machine is built to stay ahead of the pack.
  • POWER THROUGH THE FINISH: The powerful 449cc engine features new friction reduction coating on the piston for increased engine performance.
  • EVERY SECOND COUNTS: A factory-style launch control system helps put the bike’s power to the ground for maximum acceleration at the start of the race, making the holeshot yours for the taking.
  • PULL AHEAD: A flat torque curve makes it easier to get on the gas sooner, delivering smooth and powerful acceleration to pass the competition and keep you ahead of the pack.
  • FINELY TUNED POWER: Use the DFI® couplers to choose engine settings to suit your riding style or track conditions. This plug-and-play style system allows quick and easy selection from three pre-programmed fuel injection and ignition mapping settings. Fine tune your ECU setting with factory precision. The KX™ FI Calibration Kit* features a handheld controller that enables adjustment of fuel mapping and allows storage of presets without a PC. *Sold separately as a Kawasaki Genuine Accessory

Race-Ready Suspension

  • LEAVE THEM IN THE DUST: Take the lead with proven race-winning performance. The highly adjustable suspension package delivers smooth action, firm damping and contributes to optimal traction.
  • RACE READY: The 49mm Showa Coil Spring Front Fork combined with A-KIT Technology deliver excellent handling. Large-diameter inner tubes allow the use of large damping pistons for race-winning performance while a large-diameter front axle provides exceptional front-wheel traction.
  • CHAMPIONSHIP PROVEN: The Uni-Trak® rear suspension system features adjustable dual-range (high- and low-speed) compression damping, adjustable rebound damping, and adjustable preload. The result is optimal damping and rear-wheel traction.
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