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SPECIFICATIONS
Engine: Liquid-cooled, four-stroke single with DOHC and four valves
Displacement: 449cc
Bore x stroke: 96.0 x 62.1mm
Compression ratio: 12.0:1
Carburetion: Keihin FCR40
Ignition: Digital AC-CDI
Starting: Kick
Transmission: Four-speed with manual multi-disc wet clutch
Final drive: Chain
Frame: Aluminum perimeter
Rake / trail: 27.1 degrees / 4.6 in.
Front suspension / wheel travel: 48mm inverted AOS-type telescopic fork with 22-way compression damping and 20-way rebound damping / 12.4 in.
Rear suspension / wheel travel: UNI-TRAK® linkage system with 22-way low-speed and 2-turn
high-speed compression dampening, 22-way rebound dampening and
fully adjustable spring preload / 12.4 in.
Front tire: 90/100-21 51M
Rear tire: 100/90-19 57M
Front brake: Single semi-floating 250mm petal disc with dual-piston caliper
Rear brake: Single 240mm petal disc with single-piston caliper
Overall length: 86.0 in.
Overall width: 32.3 in.
Overall height: 50.4 in.
Wheelbase: 58.5 in.
Ground clearance: 13.6 in.
Seat height: 38.0 in.
Dry weight: 220.1 lbs.
Fuel capacity: 1.9 gal.
Color: Kawasaki Lime Green / Black
*Specifications are subject to change.
Features
Engine
- 449cc liquid-cooled, four-stroke single
- Wide powerband extends into the over-rev
Top End
- High-acceleration cams help the engine rev more quickly
- Camshaft lobes and tappets feature soft-nitriding surface treatment for long wear and high-rpm reliability
- Hand-finished surfaces of the polished intake ports improve intake efficiency at all rpm
- Lightweight titanium 36mm intake and 31mm exhaust valves and aluminum valve retainers reduce reciprocating weight for reliable valve control at high rpm
- Double valve springs help ensure stable valve operation
- Screw-type cam chain tensioner adjuster with pressure spring functions automatically
- Low-friction coating on piston skirt
Bottom End
- Crankshaft, rotor mass centralization, oil circulation, and ignition timing have been carefully examined to help ensure ideal engine braking characteristics
- Crankshaft and connecting rod are sintered for additional rigidity
Starting
- Features highly reliable auto-decompression system; the dual-weight centrifugal decompression system fitted to the exhaust cam eases starting, and its simple construction helps to ensure reliability
- Hot start system gives quick starts when the engine is hot, and the hot start lever is unitized with the clutch lever
- The plunger actuating the hot starter has a U-packing seal to prevent water from getting into the carburetion system
Exhaust
- Tapered all-titanium exhaust pipe expands in diameter from 38 to 41mm, contributing to both low- and high-rpm performance
- Titanium exhaust pipe heat shield
- Silencer uses new, long-fiber packing
Cooling
- Newly designed, high-capacity Denso radiators deliver superior cooling efficiency
- Slim new radiators feature more tightly packed cores and a new fin design for enhanced heat dispersion
Shifting
- Four-speed transmission features new shift drum cam to minimize shift lever play
Frame
- All-aluminum perimeter frame is composite structure comprising forged, extruded and cast components
- The slim profile of the KX450F frame, two-piece radiator shrouds that leave the upper frame spars exposed, and careful design of the remaining bodywork make the KX450F feel light and narrow beneath the rider
- Titanium footpegs and footpeg brackets
- Aluminum skid plate
Front Suspension
- Kayaba AOS (Air-Oil-Separate) fork keeps oil and air in separate chambers for stable damping performance during long motos
- Low-friction fork seals contribute to smooth action
- Plastic liners inside the fork sliders allow secondary tuning
Rear Suspension
- New UNI-TRAK® rear suspension system features linkage ratios to suit the new frame and swingarm
- Alloy swingarm uses cast front section, tapered hydroformed spars and forged chain pullers; the tapered spars are shaped to match the balance of flex and rigidity required of the aluminum frame, and allow additional clearance for the rear brake caliper when the rear suspension is fully compressed
Brakes
- Front and rear petal disc brakes help reduce unsprung weight
- Petal shapes of the discs help clean the brake pads for more efficient braking performance
Wheels
- 32-spoke rear wheel for reduced unsprung weight
From the Cockpit
- Renthal aluminum handlebars are standard
- Lightweight short-length grips feature a special pattern to reduce vibration transmitted from the bars to the rider
- Seat uses a slip-resistant top surface for good grip when seated and smooth sides for excellent rider mobility
Weight Savings
- Aluminum parts used instead of steel, including clutch cable elbow, clutch cable fitting nuts, fuel tank fitting nuts, seat mounting brackets, front brake hose clamp and igniter stay bracket
Options
- Optional cable set-up allows manual operation of the decompressor via a lever on the right handle grip
- Top mounting clamp for an oversized handlebar
- Aluminum and steel rear sprockets with optional tooth sizes
- Solid petal brake rotors for wet racing conditions
- Optional springs for the front fork and rear shock
- 20-inch front wheel |
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SPECIFICATIONS
Engine: Four-stroke single with DOHC and four valves
Displacement: 249cc
Bore x stroke: 77.0 x 53.6mm
Cooling: Liquid
Carburetion: Keihin FCR37 and hot start circuit
Compression ratio: 13.5:1
Ignition: Digital AC-CDI
Transmission: Five-speed with wet multi-disc manual clutch
Final drive: Chain
Frame: Aluminum perimeter
Rake / trail: 27.5 degrees / 4.7 in.
Front suspension / wheel travel: 47mm inverted twin-chamber telescopic fork with 16-way compression and rebound damping / 12.4 in.
Rear suspension / wheel travel: UNI-TRAK® linkage system with 13-way low-speed and 2-turn high-speed compression damping, 17-way rebound damping and fully adjustable spring preload / 12.2 in.
Front tire: 80/100-21 51M
Rear tire: 100/90-19 57M
Front brake: Single semi-floating 250mm disc with dual piston caliper
Rear brake: Single 240mm disc with single-piston caliper
Overall length: TBA
Overall width: TBA
Overall height: TBA
Ground clearance: TBA
Seat height: TBA
Dry weight: TBA
Wheelbase: TBA
Fuel capacity: TBA
Color: Kawasaki Lime Green / Black
*Specifications are subject to change.
Features
Engine
- 249cc, liquid-cooled, four-stroke engine delivers hard-hitting power from mid- to high-rpm
- Wide powerband extends smoothly into the over-rev
Top End
- Revised intake and exhaust ports, and revised combustion chamber improve low- to mid-range performance
- Rev-limiter settings and ignition timing have been revised to extend the engine’s over-rev capability
- New cam profiles help increase high-rpm performance without sacrificing low-end performance
- Piston features a thicker crown to compensate for increased power and higher compression ratio
- Once-piece magneto rotor offers improved reliability
- New stick ignition coil saves weight and offers improved performance
Bottom End
- Crankshaft is surface-hardened for additional rigidity
- Countershaft sprocket has more – and smaller – splines to increase reliability
- More efficient oil pumps increase oil flow by nearly 20 percent
Cooling
- Newly designed, high-capacity Denso radiators are slimmer
- Radiator features more tightly packed cores and a new fin design to deliver superior cooling efficiency
Shifting
- New friction plate material and stiffer clutch springs improve clutch feel
- New clutch lever design compensates for higher spring rate
- Five-speed transmission dogs are beefier to match the engine’s increased power
- Shift drum features new cam for improved shifting feel
Frame
- All-aluminum perimeter frame features composite structure, utilizing forged, extruded and cast components
- The slim profile of the frame, two-piece radiator shrouds that leave the upper frame spars exposed, and careful design of the remaining bodywork make the KX™250F feel light and narrow beneath the rider
Front Suspension
- Showa twin-chamber fork keeps oil and air in separate chambers for stable damping performance during long motos
Rear Suspension
- New UNI-TRAK® rear suspension system features revised linkage ratios to suit the new fame and swingarm
- Alloy swingarm uses cast front section, tapered hydroformed spars and forged chain pullers; the tapered spars are shaped to match the balance of flex and rigidity required of the aluminum frame, and allow additional clearance for the rear brake caliper when the rear suspension is fully compressed
- Smaller rear chain guide reduces overall weight
Brakes
- Front and rear brakes utilize new petal discs, helping to reduce overall weight
- Petal discs help to clean the brake pads for more efficient braking performance
Wheels
- New rear wheel helps to reduce unsprung weight
From the Cockpit
- Renthal aluminum handlebar is strong and reduces overall weight
- Short-length grips feature a special pattern to reduce vibration transmitted from the bars to the rider
New Styling
- New bodywork and new seat have aggressive style
Options
- Different inertia magneto rotors
- 12-tooth countershaft sprocket
- Top handlebar clamp for an oversized bar
- Aluminum and steel rear sprockets with optional tooth sizes
- Solid petal brake rotors for wet racing conditions
- Optional springs for the front fork and rear shock
- Manual decompression lever and cable
- 20-inch front wheel |
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SPECIFICATIONS
Engine: Two-stroke single with KIPS®
Displacement: 249cc
Bore x stroke: 66.4 x 72.0mm
Cooling: Liquid
Carburetion: Keihin PWK38S with Power Jet
Induction: Piston reed valve
Compression ratio: 10.5 (low speed) – 9.1 (high speed):1
Ignition: Digital CDI
Transmission: Five-speed
Final drive: Chain
Frame: Perimeter style, high-tensile steel with aluminum subframe
Rake / trail: 26 degrees / 4.1 in.
Front suspension / wheel travel: 48mm inverted cartridge-type telescopic fork with 16-way compression and rebound damping / 11.8 in.
Rear suspension / wheel travel: UNI-TRAK® linkage system with 18-way low-speed compression and 2-turn high-speed compression damping, plus 16-way rebound damping and fully adjustable spring preload / 12.2 in.
Front tire: 80/100-21 51M
Rear tire: 110/90-19 62M
Front brake: Single semi-floating 250mm petal disc with dual-piston caliper
Rear brake: Single 240mm petal disc with single-piston caliper
Overall length: 86.0 in.
Overall width: 32.1 in.
Overall height: 49.8 in.
Ground clearance: 13.4 in.
Seat height: 38.0 in.
Dry weight: 213.9 lbs.
Wheel base: 58.3 in.
Fuel capacity: 2.2 gal.
Color: Kawasaki Lime Green / Black
*Specifications are subject to change.
Features
Engine
- New piston profile helps to reduce mechanical noise
- Copper-plated steel washer improves cylinder head’s sealing performance
- KIPS® power valve O-ring offers improved sealing performance
- New reed valve stopper features new shape to improve low-rpm response – revised shape improves scavenging efficiency by facilitating airflow through the third scavenging port
- New water-pump impeller increases coolant circulation for improved high-rpm and over-rev performance
- Primary gear is now secured using a key and lock-nut to help reduce mechanical noise
- New kickstart lever has revised shape and mounting angle for improved durability
- New silencer is slightly wider and nearly two inches longer to ensure the KX™250 meets stricter noise emission standards
- New long-fiber silencer packing is more durable and requires less maintenance
Chassis
- Renthal aluminum handlebar is strong and lightweight
- Front and rear petal disc brakes help to reduce unsprung weight
- Petal-shaped discs help to clean the brake pads for more efficient braking performance
- Rear shock now features dual compression adjustability so riders have more tuning options for both low-speed and high-speed compression damping
- Fine-tuning to the Kayaba AOS (Air-Oil-Separate) fork via a new one-piece plastic sleeve inside the fork inner tubes improves suspension action at full compression
New Styling
- Aggressive Kawasaki Lime Green and black graphics are matched by a two-tone seat
Options
- Carburetor tuning parts
- Different inertia magneto rotors
- Larger countershaft sprocket
- 20-inch front wheel
- Solid brake discs for wet racing conditions
- Aluminum and steel rear sprockets
- Optional fork and shock springs
- Steel spoke nipples
- Front and rear wheel assemblies |
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SPECIFICATIONS
Engine: Two-stroke single with KIPS®
Displacement: 99cc
Bore x stroke: 52.5 x 45.8mm
Cooling: Liquid
Carburetion: Keihin PWK28
Induction: Two-petal reed valve
Compression ratio: 9.6:1 (low speed) – 8.8:1 (high speed)
Ignition: Digital CDI
Transmission: Six-speed
Final drive: Chain
Frame: High-tensile steel perimeter design with subframe member
Rake / trail: 27 degrees / 4.1 in.
Front suspension / wheel travel: 36mm inverted telescopic cartridge fork with 18-way compression damping / 10.8 in.
Rear suspension / wheel travel: UNI-TRAK® single shock system with 4-way compression and 18-way rebound damping plus adjustable spring preload / 10.8 in.
Front tire: 70/100x19
Rear tire: 90/100x16
Front brake / rear brake: Hydraulic disc / Disc
Overall length: 75.2 in.
Overall width: 28.9 in.
Overall height: 43.5 in.
Ground clearance: 15.0 in.
Seat height: 34.3 in.
Dry weight: 149.9 lbs.
Fuel capacity: 1.5 gal.
Wheelbase: 50.8 in.
Color: Kawasaki Lime Green / Black
*Specifications are subject to change.
Features
Engine Modifications for 2006
- Magneto with lower inertial moment improves low-rpm response
- Rotor comes with rare-earth magnets – the unitized piece is small, lighter and more durable
- Connecting rod big-end bearing has more rigid cage for improved durability
- New intake port shape and revised cylinder skirt allow cooling air into the crankcase chamber
- Primary gear is now secured using a lock-nut to help reduce mechanical noise
- Metafoam gaskets for the generator and water pump covers improve sealing
Liquid-cooled Engine
- Right-hand engine cover provides a separate clutch cover for quick servicing without removing the water pump
- Assures greater reliability
- Bridges between intake and exhaust ports are machined finish for increased durability
Kawasaki Integrated Power Valve System (KIPS®)
- KIPS system varies exhaust port height for increased horsepower and torque
- Produces a broad powerband with more low-end torque while retaining excellent top-end power
- Breather added to KIPS cover to improve high-rpm and overrun performance
28mm Keihin Carburetor
- Crescent slide carburetor puts the needle closer to the intake ports for excellent throttle response
- Adjustable for various conditions
Clutch
- Clutch hub rides on needle bearings for smooth action
- Large clutch plates are 119mm in diameter for durability and control
- Clutch-release lever ratio provides light clutch lever action
- Thick clutch basket housing improves durability
- Clutch plate service cover simplifies maintenance and now utilizes a metal-carbon composite gasket
Six-speed Transmission
- Fifth and sixth gears on the input shaft ride on bushings for added reliability
- Positive shifting action and rugged durability
- Allows the engine’s full potential to be realized
- Provides oil level window
- Hard chrome-finished shift forks resist wear and seizure
High-tensile Steel Perimeter Frame
- Same tubing material used on the KX™250
- Wide footpegs for better control, made of cast steel for strength
- Thick footpeg brackets withstand today’s rigorous tracks
- Engine and chassis bolts have rust-resistant coating
Fuel Tank
- Positioned in the frame to lower center of gravity and improve handling
- Features new graphics to match larger-displacement KX models
- Fitted with square inset nuts for secure mounting of shrouds and seat base
UNI-TRAK® Rear Suspension
- Swingarm uses large cross-section beams for more rigidity and control
- Swingarm incorporates cast-aluminum drive chain adjuster sections for easy chain adjustments
- Flanged collars at the bearings to protect the seals from mud
- Fully adjustable shock with compression, rebound damping and spring preload adjustments
36mm Inverted Cartridge Fork
- Upper tubes are made of aluminum and are 49.5mm in diameter for excellent control and steering response
- Compression damping is 18-way adjustable
Front and Rear Disc Brakes
- Revised front brake lever shape offers better feel
- Forged-aluminum rear brake pedal is strong, lightweight and features two seals at the pivot for smooth operation
Front and Rear Wheels
- Rear hub features two wheel bearings on the drive side of the hub for durability
- Thick spokes are used front and rear for stronger wheels, requiring less adjustment
- Light weight aluminum rims
New Seat
- Two-tone seat pattern and graphics just like other KX models |
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SPECIFICATIONS
Engine: Two-stroke single with KIPS®
Displacement: 84cc
Bore x stroke: 48.5 x 45.8mm
Cooling: Liquid
Carburetion: Keihin PWK28
Induction: Crankcase reed valve
Compression ratio: 10.0:1 (low speed) – 9.2:1 (high speed)
Ignition: Digital CDI
Transmission: Six-speed
Final drive: Chain
Frame: High-tensile steel perimeter design with subframe member
Rake / trail: 27 degrees / 3.5 in.
Front suspension / wheel travel: 36mm inverted telescopic cartridge fork with 18-way compression damping / 10.8 in.
Rear suspension / wheel travel: UNI-TRAK® single-shock system with 4-way compression and
16-way rebound damping, plus adjustable spring preload / 10.8 in.
Front tire: 70/100x17
Rear tire: 90/100x14
Front brake / rear brake: Hydraulic disc / Disc
Overall length: 71.7 in.
Overall width: 28.9 in.
Overall height: 41.5 in.
Ground clearance: 13.4 in.
Seat height: 33.1 in.
Dry weight: 143.3 lbs.
Fuel capacity: 1.5 gal.
Wheelbase: 49.4 in.
Color: Kawasaki Lime Green / Black
*Specifications are subject to change.
Features
Engine Modifications for 2006
- Magneto with lower inertial moment improves low-rpm response
- Rotor comes with rare-earth magnets – the unitized piece is small, lighter and more durable
- Connecting rod big-end bearing has more rigid cage for improved durability
- New intake port shape and revised cylinder skirt allow cooling air into the crankcase chamber
- Primary gear is now secured using a lock-nut to help reduce mechanical noise
- Metafoam gaskets for the generator and water pump covers improve sealing
Liquid-cooled Engine
- Even-running temperatures provide consistent power output
- Lightweight Electrofusion-coated cylinder improves heat transfer while resisting abrasion and seizure
- Bridges between intake and exhaust ports are machined finish for improved reliability
Kawasaki Integrated Power Valve System (KIPS®)
- KIPS system varies exhaust-port height for increased horsepower and torque
- Produces a broad powerband with more low-end torque and mid-range, while retaining excellent top-end power
- Breather added to KIPS cover to improve high-rpm and overrun performance
Clutch
- Thick base clutch hub rides on needle bearings for smooth action
- Large clutch plates are 119mm in diameter for durability and control
- Clutch-release lever ratio is designed for light clutch lever action
- Clutch plate service cover simplifies maintenance and now utilizes a metal-carbon composite gasket
Six-speed Transmission
- The fifth and sixth gears on the input shaft ride on bushings for added reliability
- Positive shifting action and rugged durability
- Shift forks are hard chrome finished to resist wear and seizing
- Convenient oil level window
- Bushings added to the second, third and fourth gears on the output shaft for increased durability
28mm Keihin PWK carburetor
- Large crescent slide carburetor positions the needle closer to intake ports for excellent throttle response and improves power
- Adjustable for various conditions
Airbox
- Large right-side cutout improves airflow for increased power
- Foam air filter is reusable after cleaning
Exhaust System
- Features large-diameter O-ring and groove on exhaust pipe for improved durability and easy installation
- Aluminum silencer re-packable like larger KX™ models
High-tensile Steel Perimeter Frame
- Wide footpegs for better control, made of cast steel for strength
- Thick footpeg brackets withstand today’s rigorous tracks
- Engine and chassis bolts have rust-resistant coating
Fuel Tank
- Gas tank design lowers center of gravity for improved handling
UNI-TRAK® Rear Suspension
- The swingarm uses large cross-section beams for more rigidity and control
- The swingarm incorporates cast-aluminum drive chain adjuster sections for easy chain adjustments and swingarm rigidity
- Flanged collars are used at the swingarm pivot bearings to protect the seals from mud
- Shock is fully adjustable for compression and rebound damping and spring preload
36mm Inverted Cartridge Fork
- Inverted forks are more rigid, providing better steering response and control
- Compression damping is 18-way adjustable
- Aluminum upper fork tubes measure 49.5mm in diameter for flex-free performance
Front and Rear Disc Brakes
- Revised front brake lever shape offers better feel
- Forged-aluminum rear brake pedal is strong, lightweight and features two seals at the pivot for smooth operation
- Strong braking power is achieved with minimal effort
Front and Rear Wheels
- Rear hub features two wheel bearings on the drive side of the hub for durability
- Rear-axle diameter is large for more rigidity
- Front and rear hubs feature seals to better protect the wheel bearings
New Seat
- Two-tone seat pattern and graphics just like other KX models |
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SPECIFICATIONS
Engine: Two-stroke single
Displacement: 64.7cc
Bore x stroke: 44.5 x 41.6mm
Cooling: Liquid
Carburetion: Mikuni VM24SS
Induction: Four-petal reed valve
Compression ratio: 8.4:1
Ignition: Digital CDI
Transmission: Six-speed
Final drive: Chain
Frame: Semi-double-cradle, high-tensile steel
Rake / trail: 27 degrees / 2.4 in.
Front suspension / wheel travel: 33mm leading axle conventional fork with four-way rebound damping / 8.3 in.
Rear suspension / wheel travel: UNI-TRAK® single shock system with four-way rebound damping and fully adjustable spring preload / 9.4
Front tire: 60/100x14
Rear tire: 80/100x12
Front brake / rear brake: Hydraulic disc / Disc
Overall length: 62.6 in.
Overall width: 29.9 in.
Overall height: 37.6 in.
Ground clearance: 12.0
Seat height: 29.9 in.
Dry weight: 125.6 lbs.
Fuel capacity: 1.0 gal.
Wheelbase: 44.1 in.
Color: Kawasaki Lime Green / Black
*Specifications are subject to change.
Features
Engine Modifications for 2006
- Digital ignition offers ideal timing for better response across the rev range
- Magneto with lower inertial moment improves low-rpm response
- Rotor comes with rare-earth magnets – the unitized piece is small, lighter and more durable
- Revised ignition coil delivers a higher secondary voltage for a hotter spark; the punchier response gives an improved acceleration feeling
- Connecting rod big-end bearing has more rigid cage for improved durability
- Primary gear is now secured using a lock-nut to help reduce mechanical noise
- A stopper has been added to the oil seal of the left crankcase for increased engine reliability
- Metafoam gaskets are now used for the generator cover, water pump cover and water pump elbow to improve sealing
Electrofusion Cylinder
- Advanced exhaust and transfer ports for increased power and performance at higher rpm
- Bridge between exhaust ports is machined for improved reliability and resistance to seizure
- Lightweight cylinder liner transfers heat efficiently
Liquid Cooling
- Large radiator provides more even-running temperatures, keeping the power output consistently strong
- Provides greater reliability
24mm Mikuni Carburetor
- Feeds a four-petal reed valve for excellent throttle response
- Allows the engine to produce more power and torque at all rpm
Six-speed Transmission
- Positive action and rugged durability
- Hard chrome-finished shift-fork ends resist wear
- Manual clutch mechanism mirrors larger KX™ models
- Clutch cover gasket now made of metal-carbon composite material
High-tensile Steel Frame
- The same strong, light, high-tech material as used on bigger KX bikes
- Exceptional torsional rigidity for superior handling
- Reinforced downtube for increased durability
- Engine and chassis bolts have new rust-resistant coating
UNI-TRAK® Rear Suspension
- Features rising-rate action: as the suspension compresses, the spring and damping strength increase progressively for a more controlled ride
Nitrogen-charged Shock
- Four-way adjustable rebound damping improves handling on rough tracks
- Rebuildable aluminum body
- External reservoir helps maintain consistent damping
Front Fork
- Four clicks of rebound-damping adjustment accommodate different riding styles and terrain
Swingarm
- Rocker arm made from forged aluminum to reduce weight and improve durability
Front and Rear Disc Brakes
- Light and powerful
- Revised front brake lever shape offers better feel
- Resist fading
- Require less lever pressure
Aluminum Rims
- Reduce unsprung weight for improved suspension action
Detachable Aluminum Silencer
- Silencer is removable from the exhaust pipe and the packing is replaceable
- Oval shape mimics the styling of larger-displacement KX models
New Seat
- Two-tone seat pattern and graphics just like other KX models |
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