2025 Kawasaki KX450X Guide

The same championship-proven engine performance found in KX motocross bikes propels the KX450X motorcycle to the finish line. Stay ahead of the competition with a powerful engine that delivers broad, useable torque and strong, responsive power.

Review – Key Features – Features & Benefits – Specifications

2025 Kawasaki KX450X: KING OF CROSS COUNTRY.

Introducing the 2025 Kawasaki KX450X…

Returning alongside the KX450 and KX450SR is the 2025 KX450X, helping to further expand and solidify the KX family of off-road motorcycles. The 2025 KX450X is an off-road cross-country competition model that features the same championship-proven technology found on KX race machines and has been purposely tuned for off-road competition. The addition of a 21”/18” wheel combination allows the power of the KX450X to be transferred directly to the ground and the Dunlop AT81 tires make sure the bike can handle the obstacles found in cross-country riding. A high-performance 49mm inverted coil-spring fork and New Uni-Trak rear suspension are inherited from its KX450 brethren, with the spring rates and damping settings optimized for the cross-country environment. The KX450X also comes with a convenient side stand for when at a stop.

2025 Kawasaki KX450X Totalmotorcycle.com Key Features

• DOWNDRAFT INTAKE TRACT AND CENTER PORT EXHAUST HELP BOOST POWER
• LOW-FRICTION ENGINE WITH FINGER-FOLLOWER VALVE ACTUATION PRODUCES POTENT POWER
• PUSH-BUTTON POWER MODE SELECTOR
• ELECTRIC START PROVIDES EASY STARTING AND QUICK RESTARTS DURING COMPETITION
• CONED DISC-SPRING HYDRAULIC CLUTCH PROVIDES CONSISTENT FEEL WITH A LIGHT PULL THROUGHOUT A MOTO
• PERIMETER FRAME CONTRIBUTES TO LIGHT, NIMBLE HANDLING
• SLIM BODYWORK FOR EASY RIDER INTERFACE
• LARGE-DIAMETER COIL SPRING FORK SIMPLIFIES SET-UP
• 449cc 4-STROKE ENGINE
• POWER MODE SELECTION WITH A HANDLEBAR-MOUNTED SWITCH
• RIDEOLOGY CONNECTIVITY – CHANGE ENGINE MAPPING WITH YOUR SMARTPHONE
• KAWASAKI TRACTION CONTROL (KTRC) WITH A HANDLEBAR-MOUNTED SWITCH
• BREMBO BRAKE COMPONENTS FOR MAXIMUM CONTROLLABILITY
• ERGO-FIT ADJUSTABLE COMPONENTS FOR RIDE POSITION OPTIMIZATION
• OFF-ROAD READY SUSPENSION, 18-IN REAR WHEEL, SEALED CHAIN, SIDE STAND

ADDITIONAL VEHICLE FEATURES:

• Lightweight aluminum perimeter frame
• Straight exhaust port and center exhaust
• ODI lock-on grips
• Quick-release side cover offers tool-less air filter access
• Streamlined ergonomics for easy rider movement
• Coned disc-spring hydraulic clutch

POWER & PERFORMANCE
BUILT TO STAY AHEAD
The same championship-proven engine performance found in KX motocross bikes propels the KX450X motorcycle to the finish line. Stay ahead of the competition with a powerful engine that delivers broad, useable torque and strong, responsive power.

CROSS-COUNTRY POWER
The KX450X motorcycle’s 449cc 4-stroke engine features a downdraft intake layout and centrally positioned straight exhaust port for high airflow efficiency to deliver robust power across the rev-range.

SMOOTH POWER DELIVERY
A flat torque curve makes it easy to get on the gas sooner, delivering smooth and powerful acceleration to pass the competition and keep you ahead of the pack.

OPTIMIZED PERFORMANCE
Engine maps are optimized for cross-country racing and are tunable using RIDEOLOGY THE APP KX on your smartphone. By tuning engine maps, the rider can change power delivery to best suit riding conditions and personal preference.

QUICK STARTING
Fast, reliable starting can make or break your race, from nailing that dead-engine start to get you out front early to restarting the engine after stalling. Electric start makes it as easy as pushing a button.

CROSS-COUNTRY TUNED SUSPENSION
DOMINATE OFF-ROAD CONDITIONS
The KX450X motorcycle’s high-performance, race-ready suspension is optimized for cross-country racing, especially on aggressive trails.

OPTIMIZED FOR CROSS-COUNTRY
A high-performance 49mm inverted Showa coil-spring fork comes directly from the KX450 motorcycle. Front spring rates and damping settings tuned for cross-country riding offer reassuring feedback, especially when riding on challenging trails.

ADJUSTABLE SETTINGS
The Uni-Trak rear suspension system features a Showa shock with adjustable dual-range (high- and low-speed) compression damping, adjustable rebound damping, and adjustable preload. The linkage system mounts the suspension arm below the swingarm, allowing a long rear suspension stroke for precise tuning. As a result, riders can optimize damping and rear-wheel traction to suit conditions and personal preference.

ADVANCED TECHNOLOGY
NEXT-LEVEL PERFORMANCE
The KX450X motorcycle’s advanced controls are streamlined for rider convenience. Kawasaki TRaction Control (KTRC), Power Mode Selection, and Launch Control Mode are available at the push of a button. These features enable riders to quickly adjust power delivery and traction for riding conditions and preference. The KX450X provides advanced technology designed to inspire confidence.

CHOOSE YOUR PREFERENCE
The KX450X motorcycle features Power Mode Selection, which allows riders to switch between 2 power modes quickly and easily. Riders can select between Normal (Full Power) and Mild response to suit riding conditions or preference. Mild response is good for riders still familiarizing themselves with the high performance of the KX450X.

KAWASAKI TRACTION CONTROL
The KX450X motorcycle features Kawasaki TRaction Control (KTRC) at the push of a button. By using the traction button (T) on the left handlebar, riders can quickly and easily select from 2 levels (Weak or Strong) of traction control to suit riding conditions and preference. Riders may also elect to turn the system off.

POWER FROM THE START
A factory-style launch control system helps put the KX450X motorcycle’s power to the ground for maximum acceleration. By pushing the Mode and Traction buttons simultaneously, riders activate the launch control system which is designed to deliver efficient race starts in low-traction conditions, making the holeshot yours for the taking.

SMARTPHONE CONNECTIVITY
Thanks to smartphone connectivity, riders can adjust engine mapping straight from their phones via RIDEOLOGY THE APP KX, without the need for extra equipment. The app also provides KX FI Calibration to fine-tune fueling and ignition timing, engine monitoring for checking engine metrics, and a maintenance log for recording memo-style logs —plus many more useful functions.

LIGHT PULL & SELF-ADJUSTING
A coned disc-spring hydraulic clutch offers light clutch pull and a wide engagement range. Compared to a conventional clutch, the hydraulic clutch offers more direct feel and lighter lever actuation, while large diameter plates provide enhanced fade resistance.

CHASSIS & ERGONOMICS
RACE-WINNING CAPABILITY
Stay ahead of the competition with a strong and lightweight chassis, agile handling, and exclusive ERGO-FIT technology.

HIGH-PERFORMANCE BREMBO BRAKE SYSTEM
A high-performance Brembo brake system delivers next-level stopping power on the KX450X motorcycle. The braking system features drilled Braking/Sunstar discs (270/240mm) paired with a Brembo caliper and master cylinder at the front and a Nissin caliper and master cylinder at the rear. The premium system offers confident controllability of the brakes, contributing to precise corner entry.

POWER TO THE GROUND
The KX450X motorcycle is built to meet the tough demands of cross-country racing. Cross-country wheels (21-in front/18-in rear) are paired with specific Dunlop Geomax AT81 tires developed for GNCC racing.

LIGHTWEIGHT & NIMBLE
A lightweight aluminum perimeter frame delivers a high level of both light, nimble handling and a composed character. Optimized rigidity balance contributes to precise front-end feel that translates to sharp cornering performance in a wide range of conditions.

GET A GRIP
Wide footpegs ensure excellent grip for optimum comfort and control and make it easy to weight the pegs.

FACTORY FIT
Find your best performance with the Kawasaki ERGO-FIT advantage. Four handlebar positions and 2 footpeg positions allow you to tailor the KX450X cross-country motorcycle to your body size, riding style, and preference.

OPTIMIZED BODYWORK
Sleek design of the shrouds, side panels, and rear fender eliminate hooking points, further facilitating rider movement.

RENTHAL FATBAR HANDLEBAR & ODI LOCK-ON GRIPS
A factory-style aluminum Renthal Fatbar handlebar comes standard. Medium-compound ODI lock-on grips offer excellent grip feel, while their screw-type fastening system greatly facilitates the task of swapping grips.

EASY ACCESS
A quick-release side cover can be removed without tools, allowing for easy access to the air filter element.

2025 Kawasaki KX450X Totalmotorcycle.com Features and Benefits

KX450X EXCLUSIVE FEATURES

The nature of off-road racing differs from that of motocross/supercross. Therefore the KX450X has the following changes from the base KX450.
• High-performance 49mm inverted coil-spring fork and New Uni Trak rear suspension come directly from the KX450 motocross racer. But since cross country courses don’t have the big jumps of a motocross track, spring rates and damping settings are optimized for off-road racing to offer
increased feedback, especially when riding on aggressive trails.
• Off-road specific 18-inch rear wheel allows tire to have a larger sidewall for a smoother ride over rocks and roots, plus better resistance to pinch flats when riding in such terrain. Dunlop AT81 tires are designed to provide maximum traction in the cross country riding environment.
• Standard side stand provides convenient parking out on the trail.

The downdraft intake and center-port exhaust significantly contribute to the potent peak power while maintaining a flat torque curve that makes it easy to accelerate and find traction. Kawasaki’s multi-time World Superbike Championship-winning engineers designed the finger-follower valve train that, combined with minimal friction loss and steep downdraft style intake tract, contributes to the power.

4-Stroke Engine
• Light piston helps minimize reciprocating weight and contribute to engine performance. The piston features a similar bridged-box bottom design
featuring fully flush internal bracing as those used on the factory racers, with a short skirt and reinforced external ribs resulting in a lighter, stronger piston.
• Thick piston top ring matches the engine’s power.
• The piston skirt is coated with a dry film lubricant to reduce friction between the piston and cylinder for increased performance.
• The connecting rod length is designed to help reduce friction.
• The plain bearings at the connecting rod big end reduce mechanical loss and help boost power, and now have greater crush height. This greater height combined with larger-diameter main journal bearings help maintain durability to match the increased engine performance
• Cylinder offset is 8.5mm forward to reduce friction and enable more efficient power generation.
• Wedge-shaped crank web increases offsetting moment for a balance factor close to 60 percent, which is close to the factory bike. The high balance factor contributes to reduced engine vibration, smoother power delivery and increased performance, especially at low rpm where response is noticeably snappier.
• Aluminum cylinder with chrome composite plating(KP) provides rapid heat transfer, superb wear resistance and optimum lubrication retention for increased performance and durability.
• Semi-dry sump(KP) lubrication system for quicker engine response. The majority of oil is stored in the transmission to keep excess oil away from the crankshaft and prevent power-robbing stirring loss. A shallow chamber collects oil at the bottom of the crankcase, where a scavenge pump moves it to the transmission. This allows the crank to be located as low as possible to help lower the center of gravity.

ENGINE

Race-tuned 4-Valve Cylinder Head(KP)
• Symmetrically aligned intake and exhaust ports optimize intake and exhaust flow efficiency for maximum performance.
• Intake valve size helps to optimize the power feel of the engine.
• Finger-follower valve train designed by Kawasaki’s multi-time World Superbike Championship winning engineers allows large diameter valves,
aggressive cam profiles and high rev limit for high-rpm performance.
• Finger-follower valve actuation reduces valve train mass by approximately 6.5 percent compared to tappet-style actuation, as well as reducing friction at the cam lobe. DLC (Diamond-Like Carbon) coating on the followers help prevent wear.
• Aggressive camshaft lobes have a chromium nitride coating for durability.
• 38mm intake and 33mm exhaust valves are titanium to help reduce weight.
• Chromium steel valve spring retainers are also light and provide reliable valve control at high rpm.
• When the cylinder head is cast the intake port cores are coated so that they have extremely smooth surfaces for increased intake efficiency.

Downdraft Intake
• Downdraft-style intake routing has a steep 40˚ approach angle for a straight approach for intake air that enhances cylinder filling efficiency and
contributes to power.
• 44mm throttle body layout is optimized to match the intake and exhaust port layout. It flows abundant air for maximum performance, especially at
high rpm and overrun. A reversed orientation tilts the butterfly valve open from the top for optimum fuel atomization from the top-mounted injector.
• Fine atomizing, 12-hole injector sprays 75 micron droplets and contributes to smooth power delivery and superb engine response at partial throttle.
• High fuel pump pressure contributes to easy rideability.
• The airbox features a new dome-shaped filter [5] that offers greater filtering area to help reduce intake resistance as the filter collects dust during a
race. It slides in and out of mounting grooves and is secured with quick release hooks for easy filter maintenance.

Resonator Exhaust
• Center-port exhaust allows a relatively long header pipe to be utilized for robust low-end power.
• The muffler is forward mounted to help centralize mass.
• A flat-shaped exhaust resonator chamber, which effectively increases exhaust pipe length and reduces exhaust noise, is located inward to prevent interference with the rider’s leg and contribute to an easy reach to the ground.

Coned Disc-spring Hydraulic Clutch
• The clutch uses a single coned disc spring instead of five coiled springs for light clutch actuation when the lever is pulled and a wide clutch engagement range that helps the rider control the clutch.
• Large diameter clutch plates and special friction plate material help to resist clutch fade. The friction plates also have offset segments to promote clean separation of the discs to help reduce drag when the clutch is disengaged.
• Kawasaki’s hydraulic clutch offers direct feel and light lever action. Less play as the clutch heats up during heavy use results in a more consistent feel

Electric Start
• Provides the convenience of quick and easy push- button engine starting.
• Powered by a lightweight, compact lithium-ion battery that helps keep weight gain to a minimum.
• Automatic centrifugal compression release system on the exhaust cam lifts one exhaust valve to facilitate starting. The system’s simple construction is light weight and highly reliable
• NOTE: Only use Lithium-ion specific battery charger to help prevent fatal battery damage.

ELECTRONICS
Power Modes
• Riders can quickly and easily switch between Normal and Mild engine mapping in the ECU by using the Mode button on the left handlebar.
• Normal mode provides full power while Mild mode softens engine response for better traction on hard-packed ground and is a good level to use for riders just becoming familiar with the KXTM450X.
• Each map can be fine-tuned using one’s smartphone with RIDEOLOGY THE APP KX.

Kawasaki TRaction Control (KTRC)
• Using the Traction button on the left handlebar pod, riders can quickly and easily select between Weak and Strong levels of traction control to suit conditions and rider preference. The system can also be turned off.
• Monitoring engine speed, the ECU senses rpm spikes when rear wheel speed increases too quickly and retards ignition timing to enhance traction.

Launch Control Mode
• Similar to the system used on the Monster Energy Kawasaki factory racers, allows riders to activate a separate engine map designed to assist them get holeshots by pressing a button.
• The Launch Control Mode uses dedicated KTRC, ignition and fuel maps to provide optimal control to maximize tire grip to help riders get strong starts.
• Even for top-level riders, controlling the massive power of the KX450X off the start requires throttle control and clutch finesse. Launch Control Mode helps riders maximize traction and increase the chance of getting a good start.
• Launch Control Mode has the greatest effect within the first few seconds of releasing the clutch off the start – the most crucial time to get ahead of rivals for better positioning going into the first corner.
• The system automatically disengages when the transmission is shifted into third gear, switching back to the normal engine map.

Aluminum Perimeter Frame (KP)
• The frame was designed to accommodate the engine’s symmetrically aligned intake and exhaust ports and delivers a high level of both light, nimble handling and a composed character. Optimized rigidity balance contributes to superb front end feel for excellent cornering performance in a wide range of conditions.
• The downtube Y joint shape and position along with upper cross pipe shape, rib shape at the swingarm bracket, and square lower cross pipe all contribute to the optimized frame rigidity.
• Tuned torsional rigidity provides excellent front end feel when cornering in a wide range of track conditions for consistent cornering performance.
• Mass centralization contributes to the nimble handling feeling.
• The engine is used as a stressed member, contributing to the frame’s rigidity balance.
• Composed of a combination of forged, extruded and cast parts, the aluminum frame is designed with a balance of torsional and longitudinal rigidity for quick handling.
• Design emphasis on providing maximum traction under acceleration. Specific chassis dimensions and design (reinforcing ribs, swingarm pivot, output shaft, linkage mounts and rear axle) placed to prevent chassis squat and improve traction.

FRAME

SHOWA 49mm Coil-Spring Fork
• Large-diameter inner tubes –the same size used on Kawasaki’s factory racers – allows large 39mm compression damping pistons and a 25mm cartridge cylinder to be used for smooth action and firm damping.
• Internal valving, adjusters and oil level were fined-tuned to match the engine and chassis characteristics.
• Kashima Coat on the fork outer tubes creates a hard, low-friction surface that helps prevent wear abrasion on the inside of the tubes so that the sliding surfaces remain smooth for a long period of time. The lubricating material in the Kashima Coat contributes to smoother suspension action,
especially at the initial part of the stroke, for a better ride feel.
• Based on feedback from Kawasaki’s factory race teams, the 22mm front axle enhances front-end traction.

New Uni-Trak Rear Suspension
• Internal valving, adjusters and oil level are fined-tuned to match the engine and chassis characteristics.
• Uni-Trak rear suspension linkage ratios selected to suit the chassis. The linkage mounts underneath the swingarm allowing additional rear suspension travel yet maintaining a low seat height. The additional rear travel offers improved suspension action over a wider range of track conditions.
• Dual compression adjustability allows high speed and lowspeed damping to be tuned separately.
• The inside of the shock reservoir has a self-lubricating alumite coating that helps prevent wear abrasion and reduces friction for smoother suspension action.

SUSPENSION

With its highly-acclaimed slim ergonomics, the KX450’s bodywork offers a smooth rider interface. The shrouds, side covers and rear fender are firm and designed to eliminate hooking points with the rider’s boots and knees for easy movement.
• Quick-release side cover can be removed without tools for easy air filter maintenance.
• Equipped with medium-compound ODI Lock-On grips [16] for rider comfort, excellent feel, and the screw-type fastening system makes changing grips simple.

High-Performance Brakes
• The 270mm Braking brand petal front brake disc is paired with a Brembo caliper and master cylinder. This combination provides strong braking force and controllability that contributes to excellent corner entry.
• Thick front lever provides great feel for precise brake control.
• A 240mm petal rear brake disc with Nissin caliper is used for a balance of strong stopping power and controllability.
• Petal disc shape helps remove dirt build up in pads, increasing performance.

Wheels/Tires
• Based on feedback from the Monster Energy Kawasaki race teams, a large-diameter rear hub provides rigidity so that loads are transferred more directly to the ground, contributing to great rear-wheel traction.

BRAKES

ERGONOMICS
A smooth, flat rider interface provides easy rider mobility on the bike. [15] Slim, Adjustable Ergonomics
• Renthal 1-1/8 inch aluminum Fatbar handlebar helps reduce vibration and shocks transmitted to the rider. The bend helps to make it easier
for the rider to weight the front wheel.
• Wide footpegs provide firm footing.
• Bodywork is designed to facilitate rider movement with long, smooth surfaces that ease sliding back and forth on the bike.

• The top of the fuel tank is designed to provide a flat progression from the seat to the tank, giving riders great freedom of movement and allowing them to sit far forward.
• Radiator shrouds are positioned close to the frame so they are slim where the rider’s knees make contact, and the single-piece design make them easy to grip with the legs.
• The radiators are turned inward 10 degrees, and combined with the narrow frame spars provide a narrow rider interface.

ERGO-FIT Components
• Upper triple clamp provides two mounting positions for the reversible handlebar clamps so that the Renthal handlebar can be set in one of four positions with a 35mm range of adjustment.
• The footpeg brackets can be mounted in two positions, allowing the rider to change footpegs height by 5mm.

Factory-style Details
• Gold finish on the oil filler, flywheel nut cap and timing inspection cap contribute to factory looks.
• A works-style Renthal aluminum handlebar is light yet strong.
• Black wheels, triple clamps, and cylinder head covers complement Kawasaki’s racing lime green color.
• Lightweight magnesium clutch, generator and cylinder head covers.
• Optional parts available through Kawasaki dealers include rear sprockets, solid brake discs, handlebar holder for 7/8” handlebar, and stiffer or softer shock springs.
• The KX graphics use an in-mold process to seal the graphic into the shroud plastic for greater longevity and an ultra-smooth outer surface.

2025 Kawasaki KX450X – Totalmotorcycle.com USA Specifications/Technical Details
US MSRP Price: $10,699 USD
Canada MSRP Price: $ See Dealer CDN
Europe/UK MSRP Price: £ NA GBP (On The Road inc 20% Vat)

Engine Type 4-Stroke, Liquid Cooled, DOHC, 4-Valve, Single Cylinder
Displacement 449cc
Bore & Stroke 96.0 x 62.1mm
Compression Ratio 12.5:1
Fuel System DFI w/ Keihin 44mm Throttle Body
Ignition Digital DC-CDI
Transmission 5-Speed
Rake/Trail 27.0˚/4.6 in.
Front Wheel Travel 12.0 in.
Rear Wheel Travel 12.1 in.
Front Tire Size 80/100-21
Rear Tire Size 120/90-19
Front Suspension 49mm Inverted Coil-Spring Fork
with fully adjustable compression and rebound damping
Rear Suspension New Uni-Trak with Adjustable Preload, Low and High Speed
Compression Damping Adjustment, Rebound Damping Adjustment
Wheelbase 58.3 in.
Front Brake Type 270mm Disc w/Brembo Caliper
Rear Brake Type 240mm Disc
Fuel Tank Capacity 1.64 gal.
Ground Clearance 13.2 in.
Seat Height 37.4 in.
Weight Without Fuel 239.8 lb.
Curb Weight= 249.9 lb.
Specifications subject to change without notice.
Ask about Kawasaki’s Team Green amateur rider support program.
(KP) = See Kaw-Pedia section for more details.
* = Changes from previous model year.
= = Includes all necessary materials and fluids to operate correctly, full tank of fuel (more than 90% of capacity) and tool kit (if supplied).

2025 Kawasaki KX450X – Totalmotorcycle.com  Canadian Specifications/Technical Details

POWER

PERFORMANCE

DETAILS

2025 Kawasaki KX450X – Totalmotorcycle.com European Specifications/Technical Details

Manufacturer Specifications and appearance are subject to change without prior notice on Total Motorcycle (TMW).