Hard-Hitting 4-Stroke Power. High-Flying 2-Stroke Weight

Serious about racing? Throw a leg over the new KX450F and blast your way to the front of the pack.

The all-new motor hits hard from down low and kicks out heaps of high-traction power. A new perimeter aluminium frame with race-tuned suspension keeps you hooked up and accelerating hard.

And trick bits like petal discs and titanium footpegs give the KX450F the edge when a tenth of a second per lap means the difference between winning and losing.


Petal Disc Brakes

Stopping power! Petal brake disc with special wave shapes help keep pads cleaner so you get maximum braking power all moto long.

Front Suspension

Holding the inside line is easy with the new 48 mm Kayaba AOS (Air-Oil-Separate) fork. Fully adjustable, it lets you tune the suspension to suit track conditions.

Frame & Rear Suspension

Go for it! A perfect combination of forgings, castings and extrusions gives the KX450F‘s new perimeter aluminium alloy frame balanced flex and high-flying lightness. New linkage ratios maximise rear wheel traction, and dual-speed compression adjustment makes the shock easy to tune.


449 cm³ liquid-cooled, 4-stroke, DOHC Single with titanium valves, double valve springs and race-ported cylinder head punches out heaps of hard-hitting power across the rev range – all with plenty of over-rev to let you keep it pinned when others have to shift. It’s easy to start too, thanks to a dual-weight centrifugal compression release.


Model Year
Engine type
Liquid-cooled, 4-stroke Single
449 cm³
Bore x stroke
96.0 x 62.1 mm
Compression ratio
Valve/Induction system
DOHC, 4 valves
Maximum power
41.5 kW {56.4 PS} / 8,500 rpm
Maximum torque
50.8 N·m {5.18 kgf·m} / 7,000 rpm
Fuel supply/Carburettor
Keihin FCR40
Digital AC-CDI
Primary kick
4-speed, return
Frame type
Perimeter, aluminium
27.1° / 117 mm
Suspension, front
48 mm upside-down AOS-type telescopic fork with 22-way compression and 20-way rebound damping
Suspension, rear
New Uni-Trak with adjustable preload, dual-speed (low: 22-way, high: 2-turns or more) compression damping and 22-way rebound damping
Wheel travel, front
315 mm
Wheel travel, rear
315 mm
Tyre, front
90/100-21 57M
Tyre, rear
120/80-19 63M
Brakes, front
Single semi-floating 250 mm petal disc, dual-piston
Brakes, rear
Single 240 mm petal disc, single-piston
Steering angle, left / right
42° / 42°
Dimensions (L x W x H)
2,185 mm x 820 mm x 1,280 mm
1,485 mm
Seat height
965 mm
Fuel capacity
7.2 L
Dry weight
99.8 kg
Automatic Headlights On (AHO)
Complies to EU emission limit



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