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Kawasaki’s all-new 2019 KX450

Kawasaki’s all-new 2019 KX450 has a new electric-start motor that pumps out 3.3bhp more, has a hydraulic clutch and is claimed to weight less than any rival Japanese 450 – although it’s still heavier than KTM and Husqvarnas.

The motor is lighter, the aluminium beam frame is slimmer, there are new A-kit style Showa forks and the bike will sell at £7399. The official information from Kawasaki – which now calls the bike the KX450 rather than KXF – reads:

The KX450 has always been built with one goal in mind: to put riders on the top step of the podium. With over 40 years of KX heritage, Kawasaki now delivers an unrivaled expert category machine with a stronger engine mounted in the leanest chassis to date. On top of that, the machine has many class defining features ensuring riders reach the podium in style.

With its factory style components and tuning – including the adoption of a new finger follower valve actuation system – the new engine of the KX450 is now even more powerful with an additional 3.4 PS to keep riders ahead of the pack. Small mistakes and sudden stalls do not matter as the electric start will make sure you can quickly fight your way back to the front of the pack and with the convenience of launch control getaways are sure and strong.

The machine now features a new hydraulic clutch offering more direct feel and a light lever action. For those who want to upgrade their riding experience, the KX450 comes with a selection of DFI couplers to easily change engine mapping while the KX FI Calibration accessory kit allows riders to go deeper into detail and fully customise engine maps. To increase performance even further, the newest addition to the KX family is trimmed of all unnecessary material and features an improved lightweight aluminum perimeter frame.

In addition to the powerful engine and slim chassis, increased front and rear traction makes sure the impressive machine can put its considerable power to the ground controllably and efficiently. The larger diameter front axle and revised rear suspension layout and linkage ratios ensure that perfect lines are achieved from gate drop to final flag. Additionally, a Showa ø 49 mm inverted front fork delivers smooth action and compliant damping in all situations, while new stronger brakes ensure great stopping power when needed with a 250 mm rear disc and oversized 270 mm front rotor combining with the new front brake master cylinder to offer all round improvements in braking performance.

The all-new bodywork not only makes the bike look more compact, it also facilitates increased rider movement while the riding position can be tailored to personal preferences due to simple and effective adjustable handlebar and footpeg positions.

The KX450 stands proud and will undoubtedly deliver more victories this season with its powerful engine, leanest chassis to date, and myriad innovative features.


Engine type

Liquid-cooled, 4-stroke Single


449 cc

Bore x stroke

96 x 62.1 mm

Compression ratio


Valve system

DOHC, 4 valves

Fuel system

Fuel injection: 43 mm x 1 (Keihin)


Digital DC-CDI

Starting System



Forced lubrication, semi-dry sump

Brakes, front

Single semi-floating 270 mm petal disc. Caliper: Dual-piston

Brakes, rear

Single 240 mm petal disc. Caliper: Single-piston

Suspension, front

49 mm inverted Separate Function front Fork Air – Triple Air Chamber (SFF-Air TAC). Compression damping: 22-way. Rebound damping: 20-way

Suspension, rear

Uni-Trak. Compression damping: 19-way (low-speed), 4-turns or more (high-speed). Rebound damping: 22-way. Spring preload: Fully adjustable




Final drive


Primary Reduction Ratio

2.727 (60/22)

Gear Ratios 1st

1.750 (28/16)

Gear Ratios 2nd

1.412 (24/17)

Gear Ratios 3rd

1.188 (19/16)

Gear Ratios 4th

1.000 (19/19)

Gear Ratios 5th

0.875 (21/24)

Final reduction ratio

3.846 (50/13)


Wet multi-disc, manual

Frame type

Perimeter, aluminium


122 mm

Wheel travel front

305 mm

Wheel travel rear

307 mm

Tyre, front

80/100-21 51M

Tyre, rear

120/80-19 63M

Steering angle, left / right

42° / 42°

L x W x H

2,185 x 830 x 1,275 mm


1,485 mm

Ground clearance

340 mm

Ground clearance

340 mm

Fuel capacity

6.2 litres

Seat height

955 mm

Curb mass

108.8 kg


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