The Z400 is powered by a responsive, rider-friendly 399cc parallel twin engine complete with assist and slipper clutch. Created with Kawasaki's unique Sugomi design philosophy, the Z400 benefits from light, predictable handling plus low weight, the combination for a middle-weight naked machine.
More rigid ø41 mm telescopic fork delivers better suspension action. The front wheel feels really planted, direction changes are made easily (even when the bike is fairly upright – handy when navigating traffic jams), and overall the suspension offers the plushness of a larger displacement bike.
With both the engine and frame being new, engine placement could also be optimised. The new chassis features a short-wheelbase/long-swingarm design, complemented by a steep caster angle that delivers light, natural handling. The bike’s light weight also contributes to the easy handling and facilitates manoeuvring when off the bike.
The new Z400 combines the sharp, aggressive style of the Z650 with the large-volume design of the Z300 to create an aggressive, agile, masculine impression. Its muscular, athletic bodywork reflects the increased performance while forming a flowing design that appears to float above the engine. Like other models in the Z Series, sugomi design elements (crouching stance, low-positioned head and upswept tail) give it a silhouette instantly recognisable as a Kawasaki Supernaked.
While seat height is 785 mm (when radial tyres are fitted), the slim design of both the seat (30 mm narrower) and the rear of the engine gives riders an unobstructed line for their feet to reach the ground.
Measuring ø310 mm (the same size as those of the Z1000), the Z400/250’s semi-floating front disc offers sure stopping power. A rigid new front brake master cylinder helps eliminate ineffective (idle) stroke, contributing to controllability, while carefully selected brake hose dimensions and material contribute to brake touch. All models are equipped with ABS and feature the latest ABS unit from Nissin, the most compact and lightweight available.
The Z400 is equipped with the same stacked instrument cluster as the Z650. Offering an easy-to-read layout, the analogue-style tachometer features a gear position indicator at its centre and sits atop a multi-function LCD screen.
Relaxed rider triangle accommodates a wide range of rider sizes and riding situations, contributing to its rider-friendly character. The relatively upright riding position and wider handlebar put the rider in the ideal position for active control, facilitating dynamic, sporty riding.
The lightweight design of the new engine and frame, plus extensive efforts to minimise weight result in a curb mass of only 167 kg for the Z400 (3 kg lighter than the Z300) – making them the lightest twin-cylinder models in their class.
Displacing 399 cm3, the new engine delivers significantly increased performance compared to its predecessor: 33.4 kW (+4.4 kW vs the 2018 Z300). The higher performance can largely be credited to the new downdraft intake, which is accompanied by a larger airbox offering increased intake efficiency. The increased performance is complemented by a rider-friendly character; the smooth response and abundant low-end torque facilitate throttle control for new and experienced riders alike.
Designing the engine from scratch allowed the engine layout to be optimised for size, weight and efficiency. The new engine is comparable in size to that of the 2013-2018 Z250. Numerous weight reduction efforts keep weight to a minimum – despite a larger displacement. The clean design trimmed of any unnecessary items, and the revamped layout enable a slim engine and a cooling system with minimised external piping.
In addition to contributing to the Z400’s sharp looks, the newly designed LED headlamp is highly visible and offers significantly increased brightness and a wider illuminated path.
The Z400 features a trellis frame similar in design to that of the Ninja H2. Kawasaki’s advanced dynamic rigidity analysis was used to ensure optimum rigidity with light weight. The engine is rigid-mounted and used as a stressed member. The new frame design contributes significantly to the bike’s low curb mass.
With both the engine and frame being new, engine placement could also be optimised. The new chassis features a short-wheelbase/long-swingarm design, complemented by a steep caster angle that delivers light, natural handling. The bike’s light weight also contributes to the easy handling and facilitates manoeuvring when off the bike.
ERGO-FIT is an interface system that allows a wide range of riders to feel at one with their machine. Genuine Kawasaki Accessories may need to be purchased for certain Ergo Fit adjustments.
ABS (Anti-lock Brake System) ensures stable braking performance by preventing wheel lock during braking.
Based on racing technology, the Assist & Slipper Clutch acts as both a back-torque limiter and a self-servo mechanism that enables a lighter clutch lever pull.
The Economical Riding Indicator is a mark appearing on the instrument panel to indicate favourable fuel consumption, encouraging fuel efficient riding.
Engine Type | Liquid-cooled, 4-stroke Parallel Twin |
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Displacement | 399 cm³ |
Bore x stroke | 70 x 51.8 mm |
Compression ratio | 11.5:1 |
Valve system | DOHC, 8 valves |
Fuel system | Fuel injection: Ø 32 mm x 2 |
Starting System | Electric |
Lubrication | Forced lubrication, wet sump |
Brakes, front | Single semi-floating 310 mm petal discs. Caliper: Single balanced actuation dual piston |
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Brakes, rear | Single 220 mm petal disc. Caliper: Dual-piston |
Suspension, front | 41mm telescopic fork |
Suspension, rear | Bottom-Link Uni-Trak, gas-charged shock with adjustable preload |
Maximum power | 33.4 kW {45 PS} / 10,000 rpm |
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CO2 Emission | 91 g/km |
Maximum torque | 37 N•m {3.8 kgf•m} / 8,000 rpm |
Transmission | 6-speed |
Final drive | Sealed chain |
Primary Reduction Ratio | 2.219 (71/32) |
Gear Ratios 1st | 2.929 (41/14) |
Gear Ratios 2nd | 2.056 (37/18) |
Gear Ratios 3rd | 1.619 (34/21) |
Gear Ratios 4th | 1.333 (32/24) |
Gear Ratios 5th | 1.154 (30/26) |
Gear Ratios 6th | 1.037 (28/27) |
Final reduction ratio | 2.929 (41/14) |
Clutch | Wet multi-disc, manual |
Frame type | Trellis, high-tensile steel |
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Trail | 92 mm |
Wheel travel front | 120 mm |
Wheel travel rear | 130 mm |
Tyre, front | 110/70R17 M/C 54H |
Tyre, rear | 150/60R17 M/C 66H |
L x W x H | 1,990 x 800 x 1,055 mm |
Wheelbase | 1,370 mm |
Ground clearance | 145 mm |
Fuel capacity | 14 litres |
Seat height | 785 mm |
Curb mass | 167 kg |