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Home / Motorcycles /Motocross / 2017 KX450F

2017 KX450F


2017 KX450F

Light and powerful, the 2017 KX450F provides sharp handling and strong circuit performance that will dominate the 450cc motocross class. Combining the light engine and chassis makes the KX450F the lightest 450cc Kawasaki Motocrosser, while a slim chassis and the powerful engine result in sharp handling and excellent circuit performance. The enhancements made to the KX450F have maintained the KX design philosophy which stretches back to the creation of the KX brand more than 40 years ago; place mid-level to expert riders on the top step of the podium, every time.

Kawasaki Technology


Hard Hitting, Fuel Injected, 4-Stroke Power

liquid-cooled, 4-stroke Single delivers hard-hitting power from low- through high-rpm. The broad powerband and responsive throttle offer a broad spread of torquey response that enables racers to get on the gas and go even from down low. Race-inspired tuning and parts like the high-performance bridged-box bottom piston (a mass-production first when introduced on the 2010 KX450F) ensure top-level performance right out of the box. Introduced in 2016, the offset cylinder and numerous changes to the intake system offer even more power, the exhaust system matches local regulations, and the accessory KX FI Controller enables map calibration without a PC. Like the chassis, the engine benefited from significant weight savings, with the engine group components weighing almost 2 kg less than the previous model! 

Intake valves have a flat surface, with a slim throat angle and tight recess (similar to valves on supersport models) contributes to the awesome high-rpm performance. Air cleaner shape and silencer construction ensure that FIM and MA noise regulations are met.

Excess material was trimmed from transmission gears and shafts results in a weight reduction of approximately 260 g when compared to the previous model.

2017 KX450HHF LB 500x375

 Light and narrow main frame

Aluminium perimeter frame is a narrow across the main beams, considerably lighter, and features revised rigidity contributing to greater front-end feel.

Width across the main frames is approximately 6 mm slimmer than the previous model.  This facilitates position changes, making it easier for riders to slide forward and backward. 

The lighter weight contributes to the bike's quicker handling.

Thick walls for the sub-frame (seat rails) offer increased strength. Slim aluminium perimeter frame is a lightweight construction composed of forged, extruded and cast parts. Chassis balance and settings were all set to suit race-experienced riders.

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Slimmer, lighter aluminium perimeter frame

The narrow frame contributes to a slim overall package with good ergonomics. The slim riding position facilitates control.

Previously an extruded part, the front down tube is now a combination forged/cast piece (front part is forged; rear part is cast). The combination of this design contributes to greater front-end feel.

The centre of gravity and key dimensions (swingarm pivot, output sprocket and rear axle locations) were chosen so that the rear tyre would drive the bike forward (instead of causing it to squat).

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Slimmer Shrouds

The inward-angled orientation of the radiators (turned in 10 degrees) allows the shrouds to be slimmer than before.

Top of the fuel tank is flat and low, for a very smooth progression from the seat to the tank.  The flat design gives the rider greater freedom of movement when changing riding position, and facilitates sitting farther forward.

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Launch Control Mode: The Holeshot Advantage

 KX motocrossers have long drawn on works technology to offer riders the best possible performance right out of the box. Launch Control Mode is just one of the factory features that give riders an edge when lining up at the start gate.

 The KX450F features a launch control system similar to that on our factory racers. With the simple press of a button, riders can activate a separate engine map designed to ensure efficient race starts in slippery conditions. (The Launch Control Mode map retards ignition timing, allowing tyres to gain grip in low-traction situations, and allowing riders to focus on their lines.) 

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Setting-adjustable motocross ECU

Lightweight ECU was designed specifically to withstand the rigors of motocross racing. ECU contains three plug and play engine maps (plus a fourth for Launch Control Mode).  Settings for the three maps can be reprogrammed with the optional KX FI Calibration Kit.

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KX FI Calibration Contoller (Accessory)

KX FI Calibration Controller, a portable handheld calibration tool, enables riders to make changes to engine maps by plugging into the ECU without needing a PC or battery. Comes equipped with seven preset map settings.

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Compact and Light Throttle Body

φ43 mm throttle body is both compact and lightweight. Ultra-fine atomising injector with 12 holes sprays particles with a droplet size of 60 μm for smooth power delivery and improved engine response at partial throttle. 

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Fuel Injection System

Designed specifically for motocrossers, the fuel injection system incorporates a small lightweight ECU and operates without a battery to further eliminate unnecessary weight. And of course, fuel injection eliminates the need to adjust engine settings to suit track and climate conditions.

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Factory Style Chassis, Components and Tuning

Matching the KX450F's lighter weight, the minimalist bodywork makes the bike look more compact. Its shroud, fender and number plate designs ensure it is the sharpest looking bike in the paddock. For 2017 Kawasaki's first in-mould graphics, used on the shrouds, result in an ultra-smooth surface and ensure the racy graphics are not easily damaged. Factory-style graphics further reflect the KX450F's highly tuned performance, and green highlights on the suspension adjusters and engine oil cap and generator cover plugs contribute to a distinctive Kawasaki look.

Aggressive design of the front fender adds to the racy looks. Rims are coated in black alumite1 – just like our factory racers. Fork and rear shock adjusters have a Candy Lime Green Type 2 alumite1 finish like our U.S. factory racers. Embossed design on the clutch cover designed to gradually appear as contact from riding boots wears off the paint. Engine covers are finished in silver paint, further reinforcing the KX450F's factory image. Large synthetic skid plates with oval holes facilitates mud removal and keeps the weight down.

Other changes include:- 2017 a new design for the aluminium rear sprocket contributes to the bike's sharp looks.

2017 Upper and lower triple clamps redesigned based on feedback from Kawasaki's factory race teams offer improved stability on corner entry, enabling quicker turn-in.

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Advanced Race Ready Suspension: SFF-Air Triple Air Chamber

The KX450F features Showa's SFF (Separate Function front Fork)-Air TAC (Triple Air Chamber). The works-replica fork is very lightweight and highly rigid, contributing to superior riding stability.  With settings chosen for high-level to expert riders, the new fork offers excellent shock absorption performance at high speeds, making it easier for racers to ride faster.

Low-friction seals, and valve settings deliver and easy fork movement, matching the pitching characteristics to the lighter chassis. 

Fork inner tubes feature lower rigidity, idealised for the chassis.

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Race Oriented Suspension

The rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately. A self-lubricating alumite coating on the tank cylinder helps prevent wear abrasion, and reduces friction for smoother suspension action.

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.

Extensive rider testing was conducted to determine the ideal linkage ratios and rear shock absorber damping settings to achieve maximum rear wheel traction.

Linkage ratios were also adjusted to suit the new, lighter chassis.

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 Slim Rider Interface

The KX450F's frame and minimalist bodywork, designed with rider ergonomics in mind, offer a slim rider interface and racer-friendly ergonomics.

Complemented by adjustable handlebar and footpeg positions, the natural riding position makes it even easier for racers to go fast.

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 Slim Rider Interface

The air cleaner shape and silencer construction ensures that FIM and MA noise regulations are met.

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Rigidity of the swingarm has been optimised. The cast front portion uses a tall and thin sided walls construction, and the wall thickness of the spars has also been idealised, with thin side walls and thick top/bottom walls. The alloy swingarm uses a cast front section, tapered hydroformed spars and forged chain adjusters.

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Adjustable Footpegs

Adjustable footpeg brackets enable riders to lower their footpeg position 5 mm.

In the lower position, Centre of Gravity is lowered as is the rider's point of view, adding to both physical and psychological stability.

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Oversize Front Disc

Oversized semi-floating petal disc brake Ø270 mm contributes to significantly stronger front brake force, as well as enhanced controllability. Complementing the large-diameter discs, a pushrod-type front brake master cylinder and front brake pads with a high coefficient of friction deliver strong braking force and superb control (especially for the initial bite and initial-mid stroke characteristics).

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Rear Facing Air Intakes

 Two rear intakes (holes added under the rear of the seat) allow air to enter the engine more easily, contributing to improved response.

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Factory KX Styling

The minimalist bodywork and aggressive fender and front number plate designs ensure the 2017 KX450F remains the sharpest looking bike in the paddock.

  • For 2017 Kawasaki's first in-mould graphics, used on the shrouds, result in an ultra-smooth surface and ensure the racy graphics are not easily damaged.
  • Rims are coated in black alumite - just like our factory racers.
  • Candy Lime Green Type II finish on the oil cap and the two plugs on the generator cover further contribute to factory looks.
  • Candy Lime GreenType II SFF-Air front fork caps.
  • Showa TAC-SFF inner fork tubes have a Super-hard titanium coating to helps resist wear and lower friction.
  • Candy Lime Green Type II adjusters on the rear shock absorber.
  • Black rear spring on the Showa rear shock.
  • Embossed design on the clutch cover designed to gradually appear as contact from riding boots wears off the paint.
  • Engine covers are finished in silver paint, further reinforcing the KX450F's factory image.

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Narrow and Flat Seat

The rider position is slim, and thanks to the flat design of the seat and tank combination, making the ergonomics racer-friendly. The seat uses a slip-resistant top surface for good grip when seated and smooth sides for excellent rider mobility. Seat urethane helps maintain the original shape longer. Seams between the shrouds, seat and side covers are very flush, which facilitates control as well as moving around on the bike. Top of the fuel tank is low, allowing an even flatter progression from the seat to the tank. The flat design gives the rider greater freedom of movement when changing riding position, and facilitates sitting farther forward.

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Lime Green

Type Liquid-cooled, 4-stroke Single
Displacement 449 cm³
Bore and Stroke 96.0 x 62.1 mm
Compression ratio 12.8:1
Valve system DOHC, 4 valves
Fuel system Fuel injection: ø43 mm x 1 (Keihin)
Ignition Digital DC-CDI
Starting Primary kick
Lubrication Forced lubrication, semi-dry sump
Transmission 5-speed, return
Final drive Chain
Primary reduction ratio 2.727 (60/22)
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
Type Perimeter, aluminium
Wheel travel:
Front 305 mm
Rear 305 mm
Front 80/100-21 51M
Rear 120/80-19 63M
Caster (rake) 28.0°
Trail 125 mm
Steering angle (left/right) 42° / 42°
Front ø49 mm inverted telescopic SFF-AIR TAC (Separate Function front Fork Air Triple Air Chamber) with adjustable compression damping and rebound damping
Rear New Uni-Trak with adjustble dual-range (high/low-speed) compression damping, adjustable rebound damping and adjustable preload
Front: Single semi-floating ø270 mm petal disc
Caliper Dual-piston
Rear: Single ø240 mm petal disc
Caliper Single-piston
Overall length 2,195 mm
Overall width 820 mm
Overall height 1,280 mm
Wheelbase 1,495 mm
Ground clearance 335 mm
Seat height 950 mm
Curb mass 108.8 kg with full tank of fuel
Fuel capacity 6.3 L
16KX450H 201LIMDRS130    
Lime Green    

Specifications mentioned here apply to & have been achieved by production models under standard operating conditions. We intend only to give a fair description of the vehicle & performance capabilities. These specifications may not apply to all machines supplied for sale. Kawasaki Heavy Industries Ltd reserves the right to alter specifications. Equipment illustrated & specifications may vary to meet individual markets.