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INFORMATION ON THIS BIKE IN OUR NEWS SECTION
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)
- Lime Green with aggressive new graphics.
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
NOTE:
Specifications subject to change without notice.
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