Th3-di3ing-br33d

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

Fuel Injection 43mm Keihin Throttle body

Ignition Digital DC-CDI

Transmission Five-speed

Rake / trail 26.7 degrees / 4.6 in.

Front suspension / wheel travel 48mm inverted, Kayaba AOS with DLC coated sliders, 22-position compression and 20-position rebound dampening adjustment / 12.4 in.

Rear suspension / wheel travel UNI-TRAK® linkage system and Kayaba shock with 22-position low-speed and stepless high-speed compression dampening, 22-position rebound dampening and fully adjustable spring preload / 12.4 in.

Front tire 90/100-21

Rear tire 120/80-19

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 58.3 in.

Ground clearance 13.4 in

Seat height 38.0 in.

Curb weight 247.2 lbs.

Fuel capacity 1.8 gal.

Color Lime Green

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KX 80. rebuilt carb. redone cooling system. still rebuilding it
01 yz 125, FMF Fatty with a Power core 2, Renthal Fat Bars, tag trees,work connection frame gaurds&skid plate&radiator gaurds. Vforce3 reeds. may 08/09 some sort of 250f here i come
Moose Racing Products http://mooseracing.com/
District 11 racing http://www.district11ama.com/
http://www.fasttraxxracing.com/
Bo's Radical Racer's. thanks for all the help

Th3-di3ing-br33d

here is some more info.

Kawasaki basically built a brand new KX450F for 2009.




The new EFI system includes a lightweight ECU, a 43mm throttle body, a newly designed lightweight aluminum in-tank fuel pump and an ultra-fine atomizing injector. Set at a 45° angle for ideal mid-range power, the 12-hole injector sprays 60-micron fuel particles for smooth power delivery and improved engine response at partial throttle.

Designed specifically for motocross, the KX450F’s EFI system can be started within three rotations of the crankshaft, eliminating the need for a battery as it uses only the electricity generated through the kickstarter. To achieve this, Kawasaki engineers had the ECU power-up at the initial movement of the kickstarter. The system delivers electricity in the following order: ECU, fuel pump, and then injector.

A new, larger AC generator rotor handles the electrical needs of the EFI system and increases the engines rotational inertia. A reshaped and lighter crankshaft balances out the bigger ACG rotor, while a wedge-shaped crank web increases the offsetting moment to help achieve a crankshaft balance factor of close to 60 percent - on par with Kawasaki’s factory racers. These changes result in reduced engine vibration, smoother power delivery and an improved low rpm throttle response.

The new engine is more compact and lighter, with a 5mm shorter cylinder head that features revised intake and exhaust ports for improved engine performance through the entire rpm range. A new piston with a reshaped top surface raises the engine’s compression ratio from 12.0 to 12.5:1 and works in conjunction with a new one-piece titanium exhaust pipe to provide improved low-mid range performance. Also new is a larger-volume silencer body that’s able to meet future noise regulations.


The engine in the KX450F comes standard with electronic fuel injection.



The new aluminum swingarm now pivots from a 3mm higher position on the frame.



Power is said to be delivered with a linear low-rpm throttle response and torque delivery that reduces fatigue.

Kawasaki engineers designed the aluminum frame, suspension components and settings to translate the powerband and responsive throttle into better drive off the corners. Lighter handling and a slimmer chassis with an optimized rigidity balance were also a goal. To achieve this, the cross-sections of the main spars were shrunk, the head pipe is slimmer and a new process was used to form the down-tube, while the reshaped sub-frame is narrower and stronger.

A total of 1.8 pounds of weight savings was achieved thanks to a blend of forged, extruded and cast parts, the revised chassis dimensions, parts reduction and gussets of the new frame. Also, an improved rigidity balance is said to help increase stability and traction.

A new aluminum swingarm is now pivoting from a 3mm higher position on the frame. The swingarm features a more tapered design with a ‘D’ profile and new cross bracket. A longer rear suspension stroke and more precise rear suspension tuning were achieved by mounting the arm of the Uni-Trak rear suspension linkage below the swingarm.

The KX450F’s suspension offers many new features for better cornering and sharper handling. The Kayaba Air-Oil-Separate (AOS) fork has a new Diamond-Like Carbon (DLC) coating on the outer surface of the inner fork tubes which offers a claimed 15% reduction in stiction when the fork is exposed to lateral forces that hamper slide action. According to Kawasaki, this results in improved fork response, especially during cornering.

Increasing the rigidity in the reshaped upper triple clamp and decreasing it in the new outer fork tubes optimized the rigidity balance of the front end. Adjusting the suspension settings and reducing the fork offset from 24 to 23mm further enhanced the new lighter handling and increased its front wheel traction. Enlarged, wraparound black fork tube guards provide greater protection for the inner tubes.

The Kayaba rear shock received a new body design and a larger 50mm piston (previously 46mm). Kawasaki says the improved response, damping and bottoming performance equate to a better ride and increased maneuvering precision. It also features a Kashima Coat treatment on the shock internals to help with sealing and friction.

Durability enhancements are not limited to internal components on the new KX450F. The larger, resin skid plate and narrower, longer lasting chain guide both offer better protection without increased weight and are examples of the race-oriented durability improvements that abound on the new KX450F.

Like the KX250F, the KX450F has new bodywork styling, including one-piece dual injected, two-tone green and white plastic shrouds and side number plates. A slimmer new seat design with firmer urethane, a non-slip top surface and smooth sides provides good seated grip and excellent rider mobility. The frame echoes the slim profile at the top, but widens at the lower end by the ankles to provide the rider with better feel and control. Wider 50mm footpegs offer increased grip and a more comfortable platform.

The 2009 KX450F will be available in Kawasaki Lime Green, with black alumite-coated rims and aggressive graphics for a factory appearance. It will retail for $7,549.


got it from 2009 Kawasaki KX250F and KX450F Preview - Motorcycle.com

__________________
KX 80. rebuilt carb. redone cooling system. still rebuilding it
01 yz 125, FMF Fatty with a Power core 2, Renthal Fat Bars, tag trees,work connection frame gaurds&skid plate&radiator gaurds. Vforce3 reeds. may 08/09 some sort of 250f here i come
Moose Racing Products http://mooseracing.com/
District 11 racing http://www.district11ama.com/
http://www.fasttraxxracing.com/
Bo's Radical Racer's. thanks for all the help