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| 2011 Kawasaki KX 450F USA |
Progressive throttle link
NEW Setting-adjustable motocross ECU
Revisions to software and hardware offer improved response at low-mid rpm and improved combustion. The KX FI Calibration Kit contains KX Racing software, an ECU controller, mounting brackets and damper, harness and USB cable. NEW Reduced noise
NEW Improved shift feeling
Shift mechanism revisions result in a firmer shift feel.
High-precision ACR
Dual-weight centrifugal decompression system offers reliable starting.
All-aluminum perimeter frame
Increased chassis flex, revised rigidity balance and new front axle collars result in lighter turning, increased rear wheel traction, a more planted feel from the front wheel and enhanced cornering accuracy.
NEW Uni-Trak rear suspension
Diamond-Like Carbon coating reduces sliding friction for improved fork action, especially during cornering. Kashima Coat and high-precision machining further reduce friction. For ’11, revised settings offer improved action and increased absorption performance.
NEW Rear shock absorber
Dual compression adjustability offers a wide range of tuning options. Kashima Coat on the tank cylinder improves action. For ’11, revised settings offer improved action and increased absorption performance.
A factory-style Renthal (standard-type) aluminum handlebar is standard equipment.
Slim rider interface
Bodywork components and seat designed to offer a slim, natural riding position making it easier for racers to go fast.
Revised pattern for the seat sides offers more grip.
The KX450F features petal brake discs front and rear.
NEW Factory styling
Hard-Hitting Fuel-Injected Power
Fuel-injected 449 cc liquid-cooled, 4-stroke Single delivers hard-hitting power from low- through high-rpm. Already featuring race-inspired tuning and parts like the high-performance piston with bridged-box bottom (a mass-production first when introduced on the 2010 KX450F), the 2011 engine receives further fine-tuning for increased low-end response, improved shift feel and other changes to meet stricter noise regulations.
Factory-racer engine tuning
- High-performance piston, featuring the same design used on our factory racers, contributes to improved performance at all rpm. The high balance factor contributes to reduced engine vibration, smoother power delivery and increased performance – especially at low rpm, where response is noticeably snappier.
Reduced noise
Improved shift feeling
Battery-less fuel injection system
The system delivers electricity in the following order: 1) ECU, 2) fuel pump, 3) injector. NEW - Lightweight flat-bottom aluminum fuel pump is located in the plastic fuel tank. For ’11, the fuel pump mounting angle was rotated 55° to offer increased reliability.
A fuel return hose from the pressure regulator ensures there is always fuel in the fuel trap.
Factory KX FI Calibration Kit (optional part # 99999-0289 )
The kit enables expert riders to adjust engine characteristics (by rewriting actual data maps) to suit their preference, record riding data, and analyze their riding data to further fine-tune their settings.
- The KX FI Calibration Kit contains KX Racing software, an ECU controller, mounting brackets and damper, harness and USB cable. Richer fuel setting fuelling 5% richer than stock
Leaner fuel setting fuelling 5% leaner than stock
Hard riding surface setting ignition retarded, fuelling richer
Soft riding surface setting ignition advanced, fuelling leaner
Beginner setting engine power suppressed: ignition
retarded, fuelling richer
Other performance-enhancing engine characteristics
- Asymmetrical high-acceleration cams yield high intake efficiency.
The extremely smooth surfaces that result increase intake efficiency at all rpm.
- Lightweight titanium valves (IN: 36 mm; EX: 31 mm) reduce reciprocating weight and offer high-rpm reliability.
- Aluminum valve spring retainers reduce reciprocating weight for reliable valve control at high-rpm.
Factory-Style Chassis Components and Tuning
Chassis balance and settings were all set to suit race-experienced riders. Lighter-handling chassis
- increased rear wheel traction
NEW - Larger-diameter front axle collars (25 mm >> 27.5 mm) with higher rigidity contribute to the more planted feel from the front wheel.
Superior rear wheel traction
- The New Uni-Trak rear suspension system mounts the suspension arm below the swingarm, allowing a longer rear suspension stroke. The longer stroke in turn allows more precise rear suspension tuning.
Race-oriented suspension
Low-friction fork seals contribute to smooth action.
NEW - Revised fork damping settings complement the changes to the frame and front axle collars, offering improved action and increased absorption performance.
NEW - Revised rear shock damping settings complement the changes to the frame and front axle collars, offering improved action and increased absorption performance.
- The rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately.
The reduced friction smoothes suspension action.
Factory-style and other race-oriented components
- The KX450F features petal brake discs front and rear. - Factory-style graphics complement the KX450F’s highly tuned performance.
Rider interface
- Lightweight short-length grips feature a pattern designed to provide excellent grip.
Engine
- Fast-idle knob on the throttle body allows riders to increase engine speed when first starting a cold engine.
Chassis
- Optional chassis parts include handlebar holder for a f28.6 mm bar (STD: f22.2 mm), aluminum and steel rear sprockets (48-52T; STD: 50T), solid petal brake rotors for wet races, and different springs for the front fork (4.6, 4.8 N/mm; STD: 4.7 N/mm) and rear shock (52, 56 N/mm, STD: 54 N/mm).
2011 Kawasaki KX 450F USA Specifications Motorcycle
MSRP: $8,149
ENGINE
Engine: Liquid-cooled, four-stroke single with DOHC and four-valve cylinder head
Displacement: 449cc
Bore x stroke: 96.0 x 62.1mm
Compression ratio: 12.5: 1
Fuel System: 43mm Keihin throttle body
Ignition: Digital DC-CDI
Transmission: Five-speed
Rake / trail: 26.7 degrees / 4.6 in.
Front suspension / wheel travel: Uni-Trak® linkage system and Kayaba shock with 50mm piston, 22-position low-speed and stepless high-speed compression damping, 33-position rebound dampening and fully adjustable spring preload / 12.4 in.
Rear suspension / wheel travel: Uni-Trak® linkage system and Kayaba shock with 50mm piston, 22-position low-speed and stepless high-speed compression dampening, 33-position rebound dampening and fully adjustable spring preload / 12.4 in.
Front tire size: 90/100-21
Rear tire size: 120/80-19
Front brakes: Single semi-floating 250mm petal disc with dual piston caliper
Rear brakes: 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: 13.2 in
Seat height: 37.8 in.
Curb weight: 249.9 lbs.
Fuel capacity: 1.9 gal.
Color Choices: Lime Green
2011 Kawasaki KX 450F - Canada Specifications
MSRP: $TBA CDN
ENGINE
Type Liquid-cooled, 4-stroke Single
Displacement 449 cc
Bore and Stroke 96.0 x 62.1 mm
Compression Ratio 12.5:1
Valve System DOHC, 4 valves
Fuel System Fuel Injection: ø 43 mm x 1 (Keihin)
Ignition Digital DC-CDI
Starting Primary Kick
Lubrication Forced lubrication, Semi-dry sump
DRIVETRAIN
Transmission 5-speed, return
Final Drive Chain
Primary Reduction Ratio 2.727 (60/22)
Gear Ratios: 1st 1.750 (28/16)
2nd 1.412 (24/17)
3rd 1.188 (19/16)
4th 1.000 (19/19)
5th 0.875 (21/24)
Final Reduction Ratio 3.846 (50/13)
Clutch Wet multi-disc, manual
FRAME
Type Perimeter, Aluminum
Wheel Travel: Front 315 mm
Wheel Travel: Rear 315 mm
Tire: Front 90/100-21 57M
Tire: Rear 120/80-19 63M
Caster (Rake) 26.7°
Trail 116 mm
Steering Angle (Left/Right) 42°/42°
SUSPENSION
Front: Type 48 mm inverted AOS-type telescopic fork
Compression Damping 22-way
Rebound Damping 20-way
Rear: Type New Uni-Trak
Compression Damping 22-way (low-speed), 2-turns or more (high-speed)
Rebound Damping 22-way
Spring Preload Fully Adjustable
BRAKES
Front: Type Single semi-floating, 250 mm petal disc
Caliper Dual-piston
Rear: Type Single 240 mm petal disc
Caliper Single-piston
DIMENSIONS
Overall Length 2,185 mm (86 in.)
Overall Width 820 mm (32.3 in.)
Overall Height 1,280 mm (50.4 in.)
Wheelbase 1,480 mm (58.3 in.)
Ground Clearance 335 mm (13.2 in.)
Seat Height 960 mm (37.8 in.)
Curb Mass 113.4 kg (250 lbs.)
Fuel Capacity 7 litres (1.54 gal.)
DETAILS
MSRP* TBA
Colours Lime Green