MODEL KX450F

MSRP $6,899

FEATURES
Engine
- 449cc liquid-cooled, four-stroke single with titanium valves.
- Revised engine tuning provides stronger low-through mid-rpm performance, with the same top-end rush.
- High-acceleration cams with revised timing help the engine rev more quickly.
- Camshaft lobes and tappets feature a soft-nitride 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 automatic cam chain tensioner with oil pressure spring.
- Revised ignition timing helps boost power.
- Low-friction coating on piston skirt.
- 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.

EXHAUST
- Larger 41mm titanium exhaust header for increased power.
- Tapered exhaust pipe joint helps increase ultra-low rpm power.
- Titanium exhaust pipe heat shield.
- Silencer uses long-fiber packing for lower maintenance.

COOLING
- High-capacity Denso radiators deliver superior cooling efficiency.
- Slim radiators feature tightly packed cores and fins designed to enhanced heat dispersion.

SHIFTING

- New 5-speed Transmission offers better choices for dealing with tough rhythm and tight technical track sections.
- New ball bearing shift lever for smoother shifting.
- Revised ratchet-type shift mechanism for smoother shifting and a more positive feel.

FRAME
- Frame is wider at the rider’s ankles, for better grip and narrower around the seat for a slim riding position and enhanced maneuverability.
- Modifications to the main frame spars reduce torsional rigidity for quicker turning and lighter steering.
- All-aluminum perimeter frame is a 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.
- Aluminum skid plate.

FRONT SUSPENSION

- New ultra-smooth DLC (Diamond Like Carbon) coating on the fork sliders reduces stiction for better suspension action.
- Kayaba AOS (Air-Oil-Separate) fork keeps oil and air in separate chambers for stable damping performance during long motos.
- Larger front fork damper cartridges with revised valving for a more progressive and plush action.
- Revised fork seals and Inner liners to complement the new DLC coated sliders and reduce stiction.

REAR SUSPENSION
- UNI-TRAK® rear suspension system features revised shock valving to maximize traction for better acceleration and enhanced controllability.
- Revised high speed compression valving in the rear shock provides smoother action in the initial part of the stroke but offers firmer damping rates near full compression.
- 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.
- New sprocket style chain roller reduces drive lash.

BRAKES
- Front and rear petal disc brakes help reduce unsprung weight.
- Disc shape helps clean the brake pads for more efficient braking performance.

WHEELS
- 32-spoke rear wheel for reduced unsprung weight.
- Lighter and stronger rear hub for increased durability and less 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.
- Revised front brake master cylinder hose joint allows more lever position adjustment.
- 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.

NEW STYLING
- New graphics and seat cover have aggressive style that emulates Kawasaki’s race bikes.
- Number plates now feature graphical highlights for a bolder appearance.
- New colored surface treatment on wheel hubs and engine covers.

OPTIONS
- Different weight magneto rotors (+/-1 kg.cm2).
- Handlebar Holder for a 28.6 mm bar (STD: 22.2 mm).
- Aluminum and Steel Rear Sprockets (+/-2T).
- Solid Petal Brake Rotors for wet races.
- Different Rate Fork and Shock Springs.
- 20” Front Wheel.
- Manual Decompression Lever & Cable.


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: Multi-map digital CDI with throttle position sensor (K-TRIC)
Transmission: Five-speed
Rake / trail: 27.1 degrees / 4.6 in.
Front suspension / wheel travel: 48mm inverted, Kayaba AOS with DLC coated sliders, 22-position compression and 20-position rebound damping adjustment / 12.4 in.
Rear suspension / wheel travel: UNI-TRAK® linkage system with 22-position low-speed and variable high-speed compression damping, 22-position rebound damping and fully adjustable spring preload / 12.4 in.
Front tire: 90/100-21
Rear tire: 120/80-19
Front brake: Semi-floating 250mm petal disc
Rear brake: 240mm petal disc
Overall length: 86.0 in.
Overall width: 32.3 in.
Overall height: 50.4 in.
Wheelbase: 58.5 in.
Ground clearance: 13.58 in
Seat height: 38.0 in.
Dry weight: 220 lbs.
Fuel capacity: 1.9 gal.
Color: Lime Green
MSRP: $6,899

MODEL KX250F

MSRP $5,999

The upgraded engine is complimented by a strengthened five-speed transmission and a revised chassis featuring increased longitudinal rigidity for lighter, quicker steering.

The new KX250F will be available in Kawasaki lime green with new colored wheel hubs, and aggressive race team graphics.

Optional parts for the KX250F include magneto rotors with different inertias, a 12-tooth countershaft sprocket, top mounting clamp for an oversized handlebar, aluminum and steel rear sprockets, solid petal brake rotors for wet races, different springs for the front fork and rear shock, manual decompression lever and cable, and a 20-inch front wheel.

FEATURES

ENGINE

- 249cc, liquid-cooled, four-stroke engine delivers hard-hitting power from mid- to high-rpm.
- Wider powerband extends low-rpm torque and increases over-rev.
- New longer, straighter airbox funnel contributes to increased low-rpm response.
- Revised carb tuning to suit the engine’s modifications.
- New hand polished intake ports. This extremely-smooth surface improves intake flow at every rpm.
- Ultra-light thin-stem titanium valves are strengthened by thicker skirts and held by longer guides for increased durability.
- Special valve seat material helps prevent wear on the titanium valves.
- K-TRIC digital microcomputer controlled ignition system with coil on plug “stick” ignition to save weight and improve performance.
- Revised ignition timing improves top-end and over-rev.
- Revised piston crown contributes to improved power at high-rpm.
- New, looser-fitting piston ring with reduced tension for lower friction.
- Crankshaft is surface-hardened for maximum rigidity.
- Twin oil pumps ensure proper lubrication and oil scavenging for optimum performance.
- Lightweight magnesium clutch, generator and cylinder head covers.

COOLING
- New 20mm taller right-side radiator offers increased cooling capacity.
- High-capacity Denso radiators are designed to offer superior cooling in a slim profile.
- Radiator features more tightly packed cores and a special fin design to deliver superior cooling efficiency.

SHIFTING
- An all-new 5-speed transmission with thicker gears offers improved shifting and increased durability.
- New shift drum with modifications to the ratchet mechanism for more positive shifting.
- New ball bearing shift shaft improves shifter feel.
- New stiffer clutch springs (up roughly 20%) give a more direct feel at the lever.
- Teflon lined clutch cable provides smooth action and clutch feel.
- 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.
- Revised frame stiffness works with new front fork tuning for lighter steering and quicker response both on the ground and in the air.
- 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.
- New works-style aluminum skid plate for added protection.

FRONT SUSPENSION
- New sub springs and revised valving for the Showa twin-chamber fork offer a more progressive response and increased bottoming resistance for lighter, quicker handling and superior suspension action.
- Showa twin-chamber fork keeps oil and air in separate chambers for stable damping performance during long motos.

REAR SUSPENSION

- New shock spring and revised valving for improved suspension action.
- A new rear shock damping adjustment needle allows more precise tuning of the rear suspension.
- 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.
- New “sprocket-style” chain roller helps smooth engine braking by reducing drive lash.

BRAKES
- Revised front brake master cylinder hose joint allows more lever position adjustment.
- Front and rear brakes utilize petal discs, helping to reduce overall weight.
- Petal discs help to clean the brake pads for more efficient braking performance.

WHEELS
- Stronger rear rim is laced to a rib-less rear hub with new spoke design that helps reduce unsprung weight.

FROM THE COCKPIT
- Renthal aluminum handlebar is ultra-strong and reduces overall weight.
- Short-length grips feature a special pattern to reduce vibration transmitted from the bars to the rider.
- Particular attention was paid to the body work underneath the seat to improve the rider‘s grip on the chassis when standing.

NEW STYLING

- New graphics and seat cover have aggressive style that emulates Kawasaki’s race bikes.
- Number plates now feature graphical highlights for a bolder appearance.
- New colored surface treatment on wheel hubs and engine covers.

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.