Kawasaki has added in its impressive motorcycle line, an all new flagship model, the KX450F. If you are serious about racing, then we believe that you will find the KX450F is a highly competitive package that will give you an edge on the track. Mid-to high-level riders will be the ones best able to fully appreciate the KX450F's potential....
2008 KX450F KEY POINTS
Improved acceleration and drive
New 5-speed transmission
Changes to suspension and frame for lighter, quicker steering
Smoother suspension action and improved damping performance
Hard hitting power from mid-high rpm
Petal shaped brake discs
Works style Renthal handlebar
Works style skid plate
New graphics
FEATURES AND BENEFITS:
ENGINE
High performance 4-stroke engine
DOHC with 4 titanium valves produces a wide powerband with high torque and rpm.
Asymmetrical high acceleration cams improve intake efficiency.
Smooth intake ports increase efficiency at all engine speeds.
Screw type cam adjuster with pressure spring ensures accurate cam chain tension and reduced mechanical noise.
Dual weight centrifugal decompression system eases starting.
Digital Acceleration Compensating Capacitor Discharge Ignition (AC-CDI)
A separate ignition map for neutral gives quick starting and a stable idle when in neutral. A second map is selected when a gear is engaged to reduce the engine braking effect.
Smooth rev limiter performance is achieved using lost spark control.
Fuel system
40 mm Keihin FCR carburettor provides quick starting, good response and a wide powerband.
Hot start lever on the left handlebar leans off the fuel mixture making starting a hot engine quick and easy.
Exhaust system
Tapered titanium exhaust pipe is lightweight and has that ‘factory’ look about it.
CHASSIS
Frame
The lightweight aluminium perimeter frame is wider at the ankles to offer grip to the rider and narrower further up for a slim riding position.
A works-style aluminium skid plate is fitted as standard.
Inverted 48 mm front fork
A twin chamber type fork with 22 way compression and 20 way rebound damping adjustment.
The inner tubes are coated with Diamond Like Carbon (DLC) to reduce friction and increase surface hardness.
Uni-Trak® rear suspension
Uni-Trak® offers superb traction and smooth suspension action across the whole stroke in a lightweight and compact suspension package.
22 way (low-speed), 2 turns (high-speed) compression and 22 way rebound damping with spring preload adjustment to tune suspension to all conditions.
Front and rear disc brakes
Petal disc brakes reduce unsprung weight and the wave shape helps clean the brake pads for more efficient operation.
Solid petal discs are available as an option for wet races.
CHANGES FROM 2007 MODEL
During the cylinder head casting process, the cores for the intake ports were given a special coating to make the intake ports smoother. The extremely smooth surfaces that result increase intake efficiency at all rpm.
New wedge sharp crankshaft webs significantly improve the balance efficiency of the crankshaft. The Balance efficiency of the '08 KX450F is on a par with James Stewart's factory racer. The result is reduced vibration, smoother power delivery and increased performance - especially at low-rpm, where response is noticeably snappier.
New Material for the connecting rod has a harder surface for reduced friction at both the big and small end
The oil pump has revised gear ratios and larger rotors increasing oil flow approximately 10%. The oil pump cover is secured using 5 bolts (previously 4) for increased sealing.
Revised piston jet has a smaller nozzle opening. The reduced tendency of oil to gather at the nozzle opening increases piston cooling performance.
Revised ignition data further reduces the already minimal chance of kickback from the kick-start lever when kicking over the engine with insufficient force.
The transmission gets a revised shift drum and cam for a better shift feel.
Lighter rate shift change springs also enhance shift touch, contributing to smoother shifting
In order to meet stricter exhaust noise regulations, the silencer is a revised design and features a baffle pipe with a new punching pattern. The new silencer minimises power loss.
A new muffler stay bracket and stronger subframe also increases durability.
While keeping high-speed straight-line stability a priority, chassis modifications aimed to improve low-speed cornering and overall ride feel.
New engine mounts incorporating collars hold the engine from a wider position (10mm further out). The resultant slight decrease in torsional rigidity contributes to quicker turning in low-speed corners, increased rear traction and an overall lighter feel.
Revised suspension settings slightly alter the bikes front/rear balance, contributing to quicker turning. The slightly stiffer settings also improve bottoming characteristics.
The front forks have an improved machining process and new low friction coating on the inside of the outer tubes for improved action and feel.
The compression damping characteristics are revised for improved mid-stroke action and rise feeling.
The rear shock absorber tank cylinder also receives the new low friction coating to improve suspension action.
New rear brake caliper guard protects it from damage
New throttle grip provides additional stability during throttle operation.
The clutch cable boot features a larger quick adjuster, allowing racers to adjust play in the clutch cable while on the fly.
The wheel rims are coated in black alumite - just like our factory racers.
COLOUR(S)
SPECIFICATION KX450D8F
Engine type. .......................... 4-stroke, liquid cooled, single cylinder,
primary kick-start with Automatic
Compression Release (ACR)
Displacement. ....................... 449 cm3
Bore x stroke. ....................... 96.0 x 62.1 mm
Valve system. ....................... 4-valve, DOHC
Compression ratio. .............. 12.0:1
Maximum power. .................. not released
Maximum torque. ................. not released
Fuel system. ......................... Keihin FCR40 carburettor
Transmission. ....................... 5-speed
Frame type. ........................... aluminium perimeter frame
Rake / trail. ............................ 27.1º / 117 mm
Suspension, front. ................ 48 mm inverted cartridge fork
Suspension, rear. ................. Uni-Trak®
Wheel travel, front / rear. ..... 315 / 315 mm
Tyre, front / rear. ................... 90/100-21 / 120/80-19
Brake, front. .......................... 250 mm semi-floating petal disc with dual piston caliper
Brake, rear. ........................... 240 mm petal disc with single piston caliper
L x W x H. .............................. 2,185 x 820 x 1,280 mm
Wheelbase. ........................... 1,485 mm
Seat height. ........................... 965 mm
Ground clearance. ................ 345 mm
Fuel tank capacity. ............... 7.2 L
Dry weight. ............................ 99.8 kg
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