- Kawasaki motorcycle model
The Kawasaki KX450F motocross motorcycle model was first presented in 2005 at the MX tournament in Japan, where critical problems in the frame design immediately appeared, which is why the start of official sales was delayed for a year, and after the problem was resolved, by 2006 the Kawasaki KX450F was officially went into series. The new model positioned itself as a replacement for the 2-stroke version of the Kawasaki KX500 (the replacement of 2-stroke cross-country bikes with 4-stroke ones was observed among all representatives of the Japanese “four”) and as a flagship in the line of cross-country motorcycles.
In the first year, the model received quite a lot of criticism from experts who, along with the excellent engine, noted the poor suspension configuration and the geometry of the motorcycle itself. In addition, the 4-speed gearbox caused a lot of confusion, which, by the way, Kawasaki replaced with a 5-speed by the next year (2007).
In 2009, the Kawasaki KX450F underwent restyling, the main innovations of which were the use of an injector. The engine increased the compression ratio, and the fuel tank capacity was slightly reduced: 7.2 → 7.0 liters.
The next major change to the model occurred in 2012. The motorcycle received a new frame, new engine settings, a slightly reduced width of the front wheel (90/100-21 → 80/100-21), a smaller fuel tank (7.0 → 6.2 l) and a launch control system (Launch Control Mode). ).
For 2021, the Kawasaki KX450F is redesigned again with updated looks, new engine tuning, chassis tuning, new Showa SFF-Air front forks and a new brake disc at the front (new shape, larger size: 250 → 270 mm).
In 2021, Kawasaki introduced a completely new generation of the model, which now does not have the letter F in the name - KX450. In addition to the appearance, the model received a new fork, a new rear shock absorber, a hydraulic clutch drive, an electric starter, new engine and injector settings (the throttle diameter was increased).
The “younger” brother of the model is the Kawasaki KX250F.
Engine
The motor of the bike is single-cylinder and four-stroke. It is liquid cooled and its volume is 449 cm³. There are four valves per cylinder. The fuel supply system is injection, and there is double injection. The peak characteristics of the engine are as follows: torque is 51 Nm, while power reaches 56 hp.
FIRST LOOK! 2021 KAWASAKI KX450F
The 2019 Kawasaki KX450F in the flesh.
We hope this is the bike we've been waiting for. To get 2019 Kawasaki has released the all-new KX450F. Return to 2015 The KX450F had the best engine in its class. In 2016 it became lighter and more agile, although the powerband became boring. The 2016-2018 KX450F does everything well, but nothing great. That's why the 2021 KX450F is ranked 5th in the 2018 MXA 450 shootout. It's hard to beat the two Austrian brothers, which are lighter, more powerful, have electric start and offer a hydraulic clutch.
For 2021, Kawasaki has stepped up its game. The all-new 2019 KX450F is more powerful and features an electric starter and hydraulic clutch. Kawasaki claims the new 2019 KX450F weighs 232.4 pounds without fuel. On MXAS Ultra-Accurate Weight, the 2018 KX450F weighed in at 231 pounds. If Kawasaki's scale were correct, the 2019 KX450F would gain just 1.4 pounds with the addition of a hydraulic clutch and electric starter. These are not KTM or Husky numbers, but they will be lighter than any other Japanese 450 on the market.
All-new features for the 2021 KX450F include a new lighter, more powerful engine, a new thinner aluminum frame, new Showa coil-sprung front forks with A-KIT technology and, of course, a new hydraulic clutch and a new electric start system.
The 2019 Kawasaki KX450F will be Eli Tomac's weapon for the 2021 season.
CHARACTERISTICS
Engine Type: Four-stroke, liquid-cooled, DOHC, 4-valve, single-cylinder Displacement: 2200cc Bore and stroke: 96.0 x 62.1mm Compression ratio: 12.5:1 Fuel system: DFI with 44mm Keihin throttle body Ignition: Digital DC -CDI Transmission Five-speed Rake/Trail: 27.6˚/4.8 inches Front Wheel Travel: 12.0 inches Rear Wheel Travel 12.1 inches Front Tire Size: 80/100-21 Rear Tire Size: 120/80-19 Front Suspension: 49-mm inverted-coil spring fork with 16-way compression and rebound damping adjustment Rear suspension: Uni-Trak with adjustable preload, 19-way (low speed) / 4-way continuously variable (high speed) compression adjustable, 22-way rebound damping adjustable Wheelbase: 58.5 inches Front Brake: 270mm Rear Brake: 250mm Fuel Capacity: 1.64 gallons Ground Clearance: 13.4 inches Seat Height: 37.6 inches Unfuelled Weight 232.4 lbs Curb Weight: 242.4 lbs
ENGINE
Engine 2021 KX450F.
The new engine has increased peak power, and a flatter torque curve makes acceleration and traction easier. Kawasaki's multiple World Superbike Championship-winning engineers developed a new follower valve system that, combined with reduced friction losses and a steeper downdraft intake tract, contributed to increased power.
FACTORY REPLICA OF FOUR DRIVE ENGINE PARTS
• The new piston is nearly 17 grams lighter, which helps reduce reciprocating weight and improves engine performance. The piston features a similar bridge box bottom design with fully smooth internal bracing as found on the factory race cars, with a short skirt and reinforced outer ribs resulting in a lighter, stronger piston. • Sleeve bearings replace needle bearings on the connecting rod head to further reduce mechanical losses and increase power. • Moves the cylinder 8.5mm forward to reduce friction and provide more efficient power generation. • Wedge-shaped crank blade increases compensating torque for a balance ratio close to 60 percent, close to the stock bike. The high balancing factor results in reduced engine vibration, smoother power delivery and improved performance, especially at low speeds where response is noticeably faster. • Aluminum cylinder with chrome-plated composite coating (KP) provides fast heat transfer, superior wear resistance and optimal lubricant retention for improved performance and durability. • Semi-dry sump (KP) lubrication system for faster engine response. Most of the oil is stored in the transmission to keep excess oil out of the crankshaft and prevent loss of power during mixing. 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 positioned as low as possible to lower the center of gravity.
FOUR VALVE CYLINDER HEAD
The finger followers operate the valves.
• New Valve Block Designed by Kawasaki's multiple World Superbike Championship-winning engineers, it allows for larger valves, more aggressive cam profiles and a higher rev limit for improved high-rpm performance. • The finger-follower drive reduces valvetrain weight by approximately 6.5% compared to the finger-follower and also reduces friction at the cam lobe. DLC (Diamond Like Carbon) coating on the tappets helps prevent wear. • More aggressive camshaft lobes are coated with chromium nitride for durability. • The intake valves have been increased from 36 to 40 mm in diameter and have 0.8 mm more lift, while the exhaust valves have grown from 31 to 33 mm in diameter and have 0.5 mm more lift. Titanium valves help reduce weight. • New chrome steel valve spring retainers also reduce weight for reliable valve control at high rpm. • When the cylinder head is cast, the intake port cores are coated, giving them extremely smooth surfaces for improved intake efficiency.
DOWNLOAD ENTRANCE
• Downdraft-style intake routing increases approach angle from 10 to 20 degrees for a uniform, more direct approach to intake air, which improves cylinder filling efficiency and contributes to increased power. • Air passes through a thinner air filter element, which is now accessible after removing the left side panel in place of the seat. • Throttle body increased from 43mm to 44mm to increase airflow for improved performance, especially at high rpm and overflow. Inverted orientation tilts the throttle valve open at the top for better fuel spray from the injector at the top. • Excellent atomization The 12-hole injector now sprays 75 micron droplets and uses 20 percent more fuel for increased power, smooth power delivery and superior engine response at part throttle. • The new fuel pump is more compact and allows for a flatter design for the top of the fuel tank.
EXHAUST RESONATOR
• New header pipe is 105mm longer, which improves low-frequency power. • The exhaust system has a resonator chamber to effectively increase the length of the exhaust pipe and reduce exhaust noise.
HYDRAULIC CLUTCH
This was the closest image Kawasaki gave us of the hydraulic clutch. Who knows, maybe they are still working out the bugs? There can't be many mistakes, since KTMs have had hydraulic clutches for 20 years.
• The fluid clutch on the KX offers a more direct feel and lighter lever action. Less play as the clutch heats up during heavy use for a more consistent feel.
ELECTRIC START
• Electric start is powered by a lightweight and compact Skyrich lithium-ion battery, which helps keep weight gain to a minimum. • Automatic Centrifugal Compression The exhaust cam exhaust system raises one exhaust valve for easy starting. Simple system design, light weight and high reliability.
Note: Use only a lithium-ion charger to prevent damage to the battery. Easy DFI Adjustment • Riders can change DFI settings simply by replacing the clutch located on the right side of the steering column.
Riders can choose between standard, hard or soft terrain settings depending on riding conditions. EASY DFI SETUP
• Riders can change the map settings simply by replacing the clutch located on the right side of the steering column. Riders can choose between standard, hard or soft terrain settings depending on riding conditions.
MANUAL TEST KX FI CALIBRATION KIT (OPTIONAL)
• Accessory KX FI Calibration Kit features a handheld controller that allows users to adjust engine performance on the fly by simply connecting the controller to the engine ECU. • The kit's user interface is easy to understand and easy to use. • Seven different maps These are loaded onto the controller to tune the ECU to suit the track conditions. Additional maps can be created and stored on the handheld controller or PC, with data transferred between the controller and PC via an SD card. • When connected to the ECU , the controller can be used to display the operating status of the engine • Can be used on all KX models equipped with DFI.
LAUNCH CONTROL MODE
• Similar to the system used on factory Monster Energy Kawasaki racers, launch control allows riders to activate a separate engine map designed to help them make shots with one button. • The launch mode map slows ignition timing, allowing the tire to gain traction in low-traction situations and allowing riders to focus on their lines. • Even for top-level racers, controlling the KX450F's massive power requires throttle control and clutch dexterity from the get-go. By slightly reducing that power, Launch Control Mode helps riders maximize traction and increase the chances of getting a good start. • Launch Control mode has its greatest effect during the first few seconds after the clutch is released at the start - this is the most important time to stay ahead of the competition for better positioning when entering the first turn. • Activated by pressing and holding the launch control button located on the left handlebar for two seconds or more in neutral, first or second gear. When activated, the indicator light next to the button flashes quickly to let the driver know that the system is activated. • The system automatically turns off when the transmission shifts into third gear, returning to normal engine mapping. • Launch Control Mode indicator light also serves as a warning light if the DFI system is faulty
FRAME
NEW ALUMINUM PERIMETER FRAME
• The new frame offers a better overall balance of rigidity. • The engine is now used as a stress member to help balance frame rigidity. • A revised steering head area with optimized stiffness, main frame rails with revised cross-sections and a revised swingarm bracket line contribute to the overall balance of rigidity. Wider lower frame rails also contribute to the overall rigidity balance. • Downtube combines a forged front end with a cast aluminum rear end for improved front-end feel. • Consisting of an aluminum frame consisting of forged, extruded and cast parts, designed to balance torsional and longitudinal rigidity for quick handling. • Design focus on maximizing traction during acceleration. Special chassis dimensions and design (stiffeners, swingarm output shaft, linkage mounts and rear axle) are placed to prevent chassis squat and improve traction.
SUSPENSION
SHOWA 49 MM SPRING FORK WITH A-KIT TECHNOLOGY
• New fork coil spring eliminates pre-ride air pressure checks. • Equipped with several elements developed in the premium aftermarket Showa A-Kit fork. • Large diameter inner tubes - the same size found on Kawasaki's factory race bikes - allow for large 39mm compression damping pistons and 25mm cartridge cylinder for smooth ride and reliable damping. • Inner Surface The outer fork tubes are textured with Showa Dimplush, which has a wave-like surface that helps retain a film of oil for a smoother ride. The Dimplush texture also features a Qasim Coating to create a hard, low-friction surface that helps prevent wear and tear so sliding surfaces remain smooth for a long time. The lubricant in the coating contributes to smoother suspension action, especially in the early part of the stroke, and a better ride feel.
• New low friction fork oil further reduces friction. • A hard titanium oxide coating on the outer surface of the inner fork tubes helps prevent wear, scratches and other damage to the tubes while reducing sticking and improving overall fork performance. • Based on feedback from Kawasaki's factory racing teams, the front axle has been increased from 20mm to 22mm to improve front end grip.
UNI-TRAK REAR SUSPENSION
• New coupling coefficients help increase rear wheel traction. • All new compact rear shocks feature a larger diameter compression adjuster that helps prevent oil cavitation during high-frequency driving.
SHOWA A-KIT SHOCK TECHNOLOGY
• The new shock position is moved 5mm to the right to provide space for the downdraft intake, plus the placement helps increase rear wheel traction. • Uni-Trak rear suspension, linkage ratios selected to match the chassis. The linkage is mounted under the swingarm, providing additional rear suspension travel while maintaining a low seat height. The additional rear travel provides improved suspension performance over a wider range of road conditions. • Dual Compression Adjustability allows high and low speed damping to be adjusted separately. • The inside of the shock absorber has a self-lubricating aluminite coating that helps prevent wear and tear and reduces friction for smoother suspension action.
BRAKES
• 270mm Braking Capacity Signature petal-shaped front rotor provides superior stopping power. • Revised front brake Master cylinder provides better initial control and helps improve braking performance. • New braking rear rotor increased from 240 to 250 mm for greater stopping power.
•
Redesigned rear brake Master cylinder and brake hose reduce weight. • The disc shape helps remove dirt accumulated on the pads, improving performance.
ERGONOMICS
• A sleeker, flatter interface improves adjustable, racer-friendly ergonomics to help racers improve lap times.
SLOW, ADJUSTABLE ERGONOMICS
• New footpegs are 5mm wider front to back and 3mm further at the rear, and the new design is also lighter. • The new body is designed to make it easier for the cyclist to travel over long, smooth surfaces, making it easier to slide forward and backward on the bike. • The top of the fuel tank has been redesigned to provide an even smoother transition from seat to tank, giving riders greater freedom of movement and allowing them to sit further forward. • New radiator shrouds are positioned closer to the frame so they are thinner where the rider's knees touch, and a new one-piece design allows for easier leg grip. • Radiators are angled inward by 10 degrees and, combined with narrow frame rails, provide a narrow rider interface
ERGO-FIT SYSTEM
• The top triple clamp provides two mounting positions for the reversible handlebar clamps, so the Rental handlebar can be mounted in one of four positions with a 35mm adjustment range. • The footrests can be installed in two positions, allowing the driver to change the height of the footrest by 5 mm.
STYLE FACTORY DETAILS
• Green trim on oil filler neck, flywheel nut cap and timing check cap provide a factory look. • performance style (standard type, K971 bend) aluminum handlebar is light but strong. • Black wheels , triple clamps and cylinder head covers complement the Kawasaki's racing lime color. • Lightweight magnesium clutch, alternator and cylinder head covers. • options include rear sprockets, solid brake rotors, handlebar mounts for 1-1/8” handlebars, and stiffer or softer shock springs. • KX Graphics use an injection molding process to seal the graphic in a plastic casing for greater durability and an ultra-smooth outer surface.
FOR ALL FIRST LOOK 2019 MODELS
Dimensions and weight
The curb weight of this bike reaches 108.7 kg. This is the average value for motocross motorcycles. The tank capacity is only 6.3 liters, which, however, is quite appropriate considering the class of the model. The wheelbase reaches 1495 mm, the seat height is 960 mm. As for the overall dimensions, the length of the bike is 2195 mm, its height is 1290 mm, and its width is 820 mm.
Chassis and brakes
The KX450F features an aluminum frame. It is perimeter in type. As for its design, it is impressive: bright colors, laconic and catchy shapes; It's immediately obvious that this is a sports bike. The spoked wheels look stylish, as does the comfortable, efficient steering wheel.
The rear suspension of the model is a progressive monoshock absorber. All possible adjustments are available. At the front it is an inverted fork with dimensions of 49 mm. All the adjustments are the same.
The rear brake is a 240 mm disc with a single-piston caliper. The front brake also has one disc, but the dimensions are already 270 mm, and the front caliper is two-piston.
Brief history of the model
2006 - start of production and sales of the model. First generation. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450D6F.
2007 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450D7F.
2008 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450D8F.
2009 - restyling of the model. Second generation. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450E9F.
2010 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450EAF.
2011 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450EBF.
2012 - restyling of the model. Third generation. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450FCF.
2013 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450FDF.
2014 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450FEF.
2015 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450FFF.
2016 - restyling of the model. Fourth generation. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450HGF.
2017 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450HHF.
2018 - no significant changes. Model: Kawasaki KX450F (North America, Europe, Australia, Japan). Factory designation: KX450HJF.
2019 - restyling of the model. Fifth generation. Model: Kawasaki KX450 (North America, Europe, Australia, Japan). Factory designation: KX450JKF.
2020 - no significant changes. Model: Kawasaki KX450 (North America, Europe, Australia, Japan). Factory designation: KX450JLF.
2021 - no significant changes. Model: Kawasaki KX450 (North America, Europe, Australia, Japan). Factory designation: KX450JMFNN.
