Key performance

60 ch
Power
🔧
449 cc
Displacement
⚖️
109 kg
Weight
💺
950 mm
Seat height
6.2 L
Fuel capacity
💰
8 899 €
New price
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Technical specifications

Changements 2007 2017
Power
60.0 ch @ 9500 tr/min (44.1 kW)
Compression ratio
12.0:1 12.8:1
Valves/cylinder
4
Camshafts
2 ACT
Fuel system
Carburettor. Keihin FCR40 Injection. 43mm Keihin throttle body
Lubrication
Forced lubrication, semi and #8209;dry sump
Ignition
Multi-map digital CDI with throttle position sensor (K-TRIC) Digital DC-CDI
Starter
Kick
Frame
Perimeter, aluminium
Clutch
Wet multi-disc
Front suspension
48mm inverted, Kayaba AOS with DLC coated sliders, 22-position compression and 20-position rebound dampening adjustment / 12.4 in. 49 mm inverted Separate Function front Fork Air - Triple Air Chamber (SFF-Air TAC). Compression damping: 22-way. Rebound damping: 20-way
Rear suspension
UNI-TRAK® linkage system with 22-position low-speed and variable high-speed compression dampening, 22-position rebound dampening and fully adjustable spring preload / 12.4 in. Uni-Trak. Compression damping: 19-way (low-speed), 4-turns or more (high-speed). Rebound damping: 22-way. Spring preload: Fully adjustable
Front wheel travel
305 mm (12.0 inches)
Rear wheel travel
305 mm (12.0 inches)
Front brakes
Single disc Single disc. Petal disc with 2-piston caliper
Rear brakes
Single disc Single disc. Petal disc with single-piston caliper
Front tyre
90/90-21 80/100-21
Seat height
965.00 mm 950.00 mm
Wheelbase
1486.00 mm 1495.00 mm
Ground clearance
345.00 mm 335.00 mm
Length
2184.00 mm 2195.00 mm
Fuel capacity
7.19 L 6.21 L
Weight
108.80 kg
Dry weight
99.80 kg
New price
8 899 €

Engine

Displacement
449 cc
Power
60.0 ch @ 9500 tr/min (44.1 kW)
Engine type
Single cylinder, four-stroke
Cooling
Liquid
Compression ratio
12.8:1
Bore × stroke
96.0 x 62.1 mm (3.8 x 2.4 inches)
Valves/cylinder
4
Camshafts
2 ACT
Fuel system
Injection. 43mm Keihin throttle body
Valve timing
Double Overhead Cams/Twin Cam (DOHC)
Lubrication
Forced lubrication, semi and #8209;dry sump
Ignition
Digital DC-CDI
Starter
Kick

Chassis

Frame
Perimeter, aluminium
Gearbox
5-speed
Final drive
Chain   (final drive)
Clutch
Wet multi-disc
Front suspension
49 mm inverted Separate Function front Fork Air - Triple Air Chamber (SFF-Air TAC). Compression damping: 22-way. Rebound damping: 20-way
Rear suspension
Uni-Trak. Compression damping: 19-way (low-speed), 4-turns or more (high-speed). Rebound damping: 22-way. Spring preload: Fully adjustable
Front wheel travel
305 mm (12.0 inches)
Rear wheel travel
305 mm (12.0 inches)

Brakes

Front brakes
Single disc. Petal disc with 2-piston caliper
Rear brakes
Single disc. Petal disc with single-piston caliper
Front tyre
80/100-21
Rear tyre
120/80-19

Dimensions

Seat height
950.00 mm
Wheelbase
1495.00 mm
Ground clearance
335.00 mm
Length
2195.00 mm
Width
820.00 mm
Height
1280.00 mm
Fuel capacity
6.21 L
Weight
108.80 kg
New price
8 899 €

Overview

Here is the Kawasaki KX 450F (2017) description translated from French to English:

Kawasaki KX 450F

Here it is, the 2017 Kawasaki KX 450F. It arrives without apparent revolution, but that’s precisely the sign of a mature machine. After the significant transformations of the previous year, Kawasaki decided to let this green beast breathe, to trust it. The result is a motocross bike that doesn’t seek to generate buzz with gadget novelties, but focuses on the essentials: victory. It’s palpable from the first glance at its sharp lines, an aesthetic that isn’t there to be pretty but to announce performance.

The heart of this Kawasaki KX 450F, its 449 cc single-cylinder engine, hasn’t been revolutionized but optimized. Kawasaki refined elements like the cylinder block and exhaust system, capitalizing on proven racing technologies, such as the internal dome piston. The objective is clear: to extract even more from this already considerable 60 horsepower, and to improve response across the entire operating range. Electronics play a major role here, with a launch control for explosive starts, a plug-and-play DFI injection system, and an adjustable ECU. The optional KX FI injection calibration kit even allows you to approach the precision of a factory team’s settings, a serious weapon for ambitious riders.

The true magic of this KX 450F, however, lies in its chassis. The work on weight, with a significant weight reduction the previous year, was crucial. At 108.8 kg fully fueled, it presents itself as one of the lightest bikes in its class. This thin and responsive perimeter aluminum frame offers handling that changes the game on a technical circuit. The 49 mm SFF-Air TAC fork, with its three air chambers, is a jewel of technology that allows for ultra-precise adjustments, offering the necessary rigidity without sacrificing progressiveness. The braking system, with its large 270 mm front petal disc, provides the power and feel that allow you to play with the limits.

This machine is designed for the competition rider, the one who aims for the first place in a national series or trains at the highest level. It is not an entry-level bike; its aggressiveness, instant power, and nervous character demand a certain level of mastery. The ergonomics have been designed for this use: a handlebar adjustable in four positions, adjustable footrests, a seamless seat, and a flat tank facilitate the rider's movements on the machine. The minimalist design, with its redesigned radiators and graphics inspired by factory bikes, completes the Kawasaki KX 450F’s appearance as a pure racing thoroughbred.

At nearly 9000 euros, it positions itself in the high-end of the category. It’s an investment for those who are not just looking for a cross bike, but a performance platform, a machine capable of competing with the best on paper and on the dirt. It carries with it the DNA of Kawasaki, a brand that has accumulated 32 AMA Supercross titles, a record. The KX 450F 2017 is not a novelty; it’s a statement. A statement that when the goal is to win, the choice naturally falls on this lime green color. It is here to add victories to the record, and to offer its rider the most intense sensations that motocross can provide.

Indicators & positioning

Weight-to-power ratio
0.54 ch/kg
🔧
Volumetric power
131.8 ch/L
In category Cross / motocross · 225-898cc displacement (383 motorcycles compared)
Power 59 ch Top 17%
17 ch median 47 ch 63 ch
Weight 109 kg Lighter than 53%
103 kg median 109 kg 132 kg
P/W ratio 0.54 ch/kg Top 14%
0.13 median 0.46 0.58 ch/kg

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