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2019 Kawasaki KX450 Powerful Motocross Review Specs Price

For decades, Kawasaki KX bikes have been ruling the off-road terrains, winning several championships. Keeping the legacy of KX450 in mind, the engineers have completely redesigned the 2019 Kawasaki KX450 Powerful Motocross. It comes with a powerful engine, race-ready suspension, and a new electric start with an all-new unrivaled KX450 built for the top of the podium.

No motorcycle in the market can compete with the legacy of the Kawasaki KX lineup. The whole lineup consists up of powerful and authentic motorcycles that are ideal for off-road riding. Furthermore, the all-new KX450 features the new engine attached with its leanest chassis to date for better lap times to put its riders on top of the podium.

Even with the addition of electric start, hydraulic clutch, and all-new 49mm Showa coil-spring forks with A-KIT technology, the new 2019 Kawasaki KX450 Powerful Motocross remains lighter than most other models in its class. It is the strong and highest level of motorcycle that is available with added quality and durability.

2019 Kawasaki KX450 Powerful Motocross – Features and Price

2019 Kawasaki KX450 Powerful Motocross

Engine Features

The new 2019 Kawasaki KX450 Powerful Motocross engine features enhanced peak power while a flatter torque curve makes it easier to increase speed and find traction. The Kawasaki’s multi-time World Superbike Championship-winning engineers have redesigned the finger-follower valve train combined with reduced friction loss and steeper downdraft styling intake tract that helps in power gain.

The new piston is about 17 grams lighter that helps in reducing reciprocating weight and contributing to the engine’s increased performance. The piston contains a similar bridged-box bottom design incorporating thoroughly flush internal bracing. The factory racers with a bit of skirt and reinforced external ribs, causing a lighter and stronger piston. The plain bearings replace the needle bearing at the connecting rod big end to reduce mechanical loss to its minimum level and boost power output. The cylinder offset of 8.5mm comes as a standard that helps in reducing friction, and it enables more efficient power generation. The wedge-shaped crank web increases offsetting moments for a balance factor close to 60% close to the factory motorcycle. The high balance factor helps in reducing engine vibration, smoother power delivery, and better performance, especially at low rpm, where the response is noticeably snappier.

The new aluminum cylinder with chrome composite plating (KP) offers rapid heat transfer, ultimate wear resistance, and better lubrication retention for improved performance and durability. The semi-dry-sump (KP) lubrication system comes standard for quicker engine response. Most oil is stored in the transmission to maintain excess oil away from the crankshaft and avoid power-robbing stirring loss. A shallow chamber gathers oil at the bottom of the crankcase, where a scavenge pump moves into the transmission. It allows the crank to be positioned as low as possible to help lower the center of gravity.

Kawasaki’s multi-time World Superbike Championship-winning engineers considered the new finger-follower valve train, allowing the large diameter valves with more aggressive cam profiles and higher rev limit to ensure high rpm performance. The finger-follower valve actuation reduces valve train mass by approximately 6.5 percent compared to tappet-style actuation and reduces friction at the cam lobe. In addition, the DLC coating on the followers helps in preventing wear. The new aggressive camshaft lobes feature a chromium nitride coating for reliability and outstanding durability. In addition, intake valves were increased from 36mm to 40mm in diameter and featured 0.8mm higher lift, while the new exhaust valves grew from 31mm to 33mm that features 0.5mm more ride. The new titanium valves help in reducing overall weight. In addition, the new chromium steel valve spring retainers come with reduced weight for better valve control at high rpm.

2019 Kawasaki KX450 Powerful Motocross

The latest downdraft-style intake routing improves approach angle from 10- to 20-degree for an even straighter approach for intake air that improves cylinder filling efficiency to contribute to more power. A new airflow through a thinner air filter element is now accessible by removing the left side panel instead of the seat. The throttle bore is increased from 43mm to 44mm flows more air for improved performance, especially at high rpm and overrun. A reversed orientation tilts the butterfly valve opens from the top for better fuel atomization from the top-mounted injector. The new fine atomization with 12-hole injectors now sprays 75-micron droplets and flows 20 percent more fuel to contribute more power, smooth power delivery, and superb engine response at partial throttle. The new fuel pump is compact, and it helps in a flattering design for the top of the fuel tank.

The new header pipe is about 105mm longer, which helps in increased low-end power. The new exhaust system contains a resonator chamber to increase exhaust pipe length and reduce exhaust noise effectively. The Kawasaki’s first hydraulic clutch on the KX bike gives a more direct feel and lighter lever action. An electric start offers the convenience of a quick and easy push-button engine start powered by a lightweight and compact lithium-ion battery that helps keep weight gain to a minimum level. An automatic centrifugal compression release system on the exhaust cam lifts one exhaust valve to facilitate starting. The system’s simple construction is lightweight and highly reliable. Furthermore, the rider can change DFI settings by simply replacing a coupler positioned on the right side of the steering stem. The riders can choose between hard, standard, and soft terrain settings to suit riding conditions.

An optional accessory KX-FT Calibration Kit contains a handheld controller that allows the rider to adjust the engine’s characteristics trackside simply by plugging the controller into the engine’s ECU. The kit’s user interface is straightforward to understand, and it is clear to use. Seven different maps come by default on the controller to adjust the ECU to suit track conditions. An additional map can be created and stored on the handheld controller or a PC, with data transfer between the bike’s controller and PC performed via SC card. When connected to ECU, the controller can be used to display the status of a running engine.

The new launch control model comes standard. It is similar to the one used on the Monster Energy Kawasaki factory racers. It allows riders to activate a separate engine map designed to assist them in getting holeshots simply by pressing a button. The new Launch Control Mode map retards ignition timing, allowing the tire to gain grip in a low traction situation and helping the rider focus on their lines. Even for the top-level riders, controlling the massive power of the new 2019 Kawasaki KX450 Powerful Motocross off the start requires throttle control and clutch finesses.

The Launch Control mode helps the rider maximize traction and enhance getting a good start by decreasing the power. The Launch Control Mode has the most significant effect within the first few seconds of releasing the clutch off the beginning while the most crucial time to get ahead of a competitor for better locating going into the first corner. The button is mounted at the left handlebar, and it can be activated by pressing and holding the launch control button for two seconds or more while in neutral, first, and second gear. When started, the indicator lamp next to the button flashes quickly to let the rider know that the system is engaged. When the transmission is moved into third gear, it automatically disengages, shifting back to the standard engine map.


The new 2019 Kawasaki KX450 Powerful Motocross features an all-new Aluminum Perimeter Frame that offers a better overall rigidity balance. The engine of KX450 is used as a stressed member that adds to the frame’s rigidity balance. In addition, a revised steering head area with greater rigidity, main frame rails with revised cross-sections, and improved line for swingarm brackets help in balancing overall rigidity. The wider lower frame rails also provide a gain in rigidity balance. Furthermore, the down tube combines in a forged front portion having cast aluminum rear piece that contributes to a better frontend feel.

2019 Kawasaki KX450 Powerful Motocross

It is composed of a combination of forged, extruded, and cast parts. It is designed with a balance of torsional and longitudinal rigidity for quick handling—the overall design emphasis offering maximum traction under acceleration. In addition, the specific chassis dimension and design help in preventing chassis squat and improves traction.


The new 2019 Kawasaki KX450 Powerful Motocross features the further Showa 49mm Coil-Spring Fork with A-Kit technology. The new coil-spring fork eliminates pre-ride air pressure checks. The suspension system comes with several items developed in Showa’s A-Kit premium aftermarket performance kit fork. The new large-diameter inner tubes are the same size tubes used on Kawasaki’s factory racers, allowing a significant 39mm compression damping position and 25mm cartridge cylinder for smoother action. In addition, the front axle is increased from 20mm to 22mm to ensure better frontend traction.

The new Uni-Trak rear suspension features the new linkage ratios that contribute to increased rear wheel traction. The new compact design rear shock features a a more oversized diameter compression adjuster that helps prevent oil cavitation under high-frequency movement; It is equipped with Showa A-KIT shock technology items. The new shock is mounted 5mm to the right to give room for the downdraft intake, including the placement contributes to increased rear wheel traction. The Uni-Trak rear suspension linkage ratios were selected to suit the chassis. The linkage mounts underneath the swingarm allow additional rear suspension travel yet while having a low seat height. Other rear travel gives better suspension action over a broader range of track conditions. The dual compression adjustability helps in high-speed and low-speed damping to be tuned separately. The inside of the shock reservoir features a self-lubricating alumite coating that helps prevent wear abrasion and reduce friction for better suspension action.

2019 Kawasaki KX450 Powerful Motocross


The new 2019 Kawasaki KX450 Powerful Motocross features quite a big braking brand petal front brake disc, i.e., 270mm, offering superb stopping power. The revised front brake master cylinder offers better initial control while helping in overall braking performance. The new larger rear braking brand petal brake disc has been used, i.e., 250mm, to ensure greater stopping power. The revised rear brake master cylinder and brake hose help reduce overall weight, while the petal disc shape helps remove dirt build-up in pads, thus increasing performance.


The new 2019 Kawasaki KX450 Powerful Motocross comes with a smoother and flatters rider interface that improves the adjustable racer-friendly ergonomics to help the rider improve lap times. The new footpegs feature 5mm wider front to rear and are positioned 3mm further rearward, and the new design is also nimbler than the 2018 Kawasaki KX450. The new bodywork facilitates rider movement with a long and smooth surface that eases sliding forth and back on the motorcycle. In addition, the top of the fuel tank was redesigned to give an even flatter progression from the seat to the tank offering riders greater freedom of movement and helping them sit farther forward.

2019 Kawasaki KX450 Powerful Motocross

The new radiator shrouds are located closer to the frame, so they are slimmer where the rider’s knees make contact, and the new single-piece design helps make them easier to grip with the legs. The new radiators are now turned inward about 10-degree and combined with the narrow frame spars offering a thin rider interface. The triple upper clamp provides two mounting positions for the reversible handlebar clamps so that the Renthal handlebar can be set in four different places with a 35mm range of adjustment. The footpeg brackets can be fixed in two positions helping the rider change height by 5mm.


The new green finishing on the oil filler, flywheel nut cap, and timing inspection cap helps the factory look. The works-style Renthal aluminum handlebar is not only light but strong as well. The new black wheel, cylinder head, and triple clamps cover complement Kawasaki’s racing lime green color, while the lightweight magnesium clutch, generator, and cylinder head covers are all-new. The Kawasaki KX graphics use an in-mold process to seal the graphic into the shroud plastic for better longevity and an ultra-smooth outer surface.

2019 Kawasaki KX450 Powerful Motocross

2019 Kawasaki KX450 Powerful Motocross – Price

The new 2019 Kawasaki KX450 Powerful Motocross is available at the price of $9,299 only.

2019 Kawasaki KX450 Powerful Motocross – Technical Specifications

2019 Kawasaki KX450 Powerful Motocross Specs


Engine 4-stroke, Single-cylinder, water-cooled, DOHC
Displacement 449cc
Bore x Stroke 96 mm x 62.1 mm
Compression Ratio 12.5:1
Fuel System DFI® having a 44 mm Keihin throttle body
Ignition Digital CDI including electric start
Transmission 5-speed, return shift
Final Drive Chain

2019 Kawasaki KX450 Powerful Motocross Specs


Front Suspension / Wheel Travel 49 mm of inverted coil-spring telescopic fork including adjustable compression and rebound damping/12 inches
Rear Suspension / Wheel Travel New Uni-Trak® including adjustable dual-range (high/low-speed) compression damping, adjustable rebound damping and adjustable preload/12.1 inches
Front Tire 80/100-21
Rear Tire 120/80-19
Front Brakes Single semi-floating 270mm Braking® petal disc having the dual-piston caliper
Rear Brakes Single 250mm Braking® petal disc having the single-piston caliper

2019 Kawasaki KX450 Powerful Motocross Specs


Frame Type Aluminum perimeter
Rake / Trail 27.6-degree/4.8 inches
Overall Length 86 inches
Overall Width 32.7 inches
Overall Height 50.2 inches
Ground Clearance 13.4 inches
Seat Height 37.6 inches
Curb Weight 242.4 lb
Fuel Capacity 1.64 gallons
Wheelbase 58.5 inches
Color Choices Lime Green
Warranty Not Available
Kawasaki Protection Plus™ (optional) Not Available

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