KAWASAKI
2018 - 2022 KAWASAKI EX 400 NINJA

EX 400 NINJA (2018 - 2022)

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Kawasaki Ninja 400 (2018-2022) Review: A Lightweight Sportbike That Punches Above Its Weight

Introduction

The Kawasaki Ninja 400, produced from 2018 to 2022, redefined the lightweight sportbike segment with its blend of approachable performance, sharp styling, and track-inspired DNA. Designed to bridge the gap between entry-level agility and mid-size power, this generation of the Ninja 400 became a favorite for new riders and seasoned enthusiasts alike. After spending a week with a 2021 Ninja 400 KRT Edition, it’s clear why this bike remains a benchmark in its class—even years after its debut. Let’s dive into what makes this machine tick.


Design: Sugomi Styling Meets Everyday Practicality

The Ninja 400’s design borrows heavily from Kawasaki’s flagship Ninja H2 and ZX-10R, giving it a premium, aggressive aesthetic that belies its accessible nature. The angular fairings, twin LED headlights, and sharp tail section create a crouching predator stance. The KRT Edition adds racing flair with its lime green accents and Kawasaki Racing Team graphics, but even base models turn heads with options like Metallic Matte Twilight Blue or Pearl Blizzard White.

Key Design Highlights:
- LED Lighting: The slim headlights and ZX-10R-inspired taillight enhance visibility and modernize the bike’s profile.
- Wind Protection: The small windscreen channels airflow cleanly over the rider, though taller riders might crave more coverage at highway speeds.
- Ergonomics: With a 785 mm (30.9") seat height and narrow profile, the bike accommodates shorter inseams without sacrificing sporty posture. The slightly rearset footpegs and upright handlebars strike a balance between agility and comfort.


Engine and Performance: Twin-Cylinder Versatility

At the heart of the Ninja 400 is a 399cc parallel-twin engine that delivers 45 HP (33.6 kW) at 10,000 RPM and 38 Nm (28 lb-ft) of torque at 8,000 RPM. The liquid-cooled DOHC powerplant is a masterpiece of flexibility: it’s docile enough for city commutes but comes alive when revved.

On the Road:
- Low-End Grunt: The engine pulls smoothly from 3,000 RPM, making stop-and-go traffic a breeze.
- Mid-Range Punch: Between 6,000–9,000 RPM, the Ninja 400 feels lively, accelerating from 0–100 km/h (0–62 mph) in 4.3 seconds.
- Top-End Thrills: While the redline sits at 12,000 RPM, power tapers slightly past 10,000 RPM—but the exhaust note crescendos into a satisfying growl.

The 6-speed gearbox, paired with an assist-and-slipper clutch, is butter-smooth. Downshifts are stress-free thanks to the slipper function, which prevents rear-wheel hop during aggressive braking.


Handling and Dynamics: Lightweight Precision

Kawasaki’s trellis frame and 41mm telescopic fork give the Ninja 400 a nimble, confidence-inspiring chassis. Weighing just 166 kg (366 lbs) wet, the bike flicks through corners with minimal effort.

Key Handling Traits:
- Flickability: The short 1,370 mm (53.9") wheelbase and 24.7° rake make direction changes almost telepathic.
- Stability: At highway speeds (140–150 km/h or 87–93 mph), the bike remains planted, though crosswinds can nudge the lightweight frame.
- Braking: The 310mm front petal disc with dual-piston calipers offers strong bite, while the ABS (optional on base models) intervenes smoothly during panic stops.

The suspension leans toward comfort, absorbing potholes without jarring the rider. However, aggressive riders might crave adjustable damping for track days.


Comfort and Daily Usability

Kawasaki nailed the ergonomics for urban and weekend riding:
- Seat: The thick, low-rebound foam cushions long rides, though it firms up after 90 minutes.
- Wind Management: The fairing deflects most turbulence at speeds under 110 km/h (68 mph).
- Fuel Efficiency: Averaging 4.17 L/100 km (56.4 MPG), the 14L (3.7-gallon) tank delivers 330+ km (205+ miles) per fill-up.

The Economical Riding Indicator nudges riders toward fuel-efficient habits—a thoughtful touch for commuters.


Technology: Just Enough to Impress

While not overloaded with gadgets, the Ninja 400’s tech suite focuses on rider engagement:
- Instrument Cluster: Analog tachometer flanked by a digital display showing gear position, fuel range, and average consumption.
- ABS: Standard on KRT and SE models, optional elsewhere.
- LED Lighting: Enhances visibility and modernizes the bike’s look.


Competition: How Does It Stack Up?

The Ninja 400 faces stiff rivals, but it holds its ground:

| Model | Power | Torque | Weight | Key Strengths |
|----------------------|-------------|------------|--------------|----------------------------------------|
| Kawasaki Ninja 400 | 45 HP | 38 Nm | 166 kg | Balance of power, comfort, and price |
| Yamaha YZF-R3 | 42 HP | 29 Nm | 171 kg | Sharper handling, higher revs |
| KTM RC 390 | 43 HP | 37 Nm | 158 kg | Track-focused chassis, aggressive ergo |
| Honda CBR500R | 47 HP | 43 Nm | 192 kg | Torquier engine, premium build quality |

Verdict: The Ninja 400 strikes the best balance for real-world riding. It’s more powerful than the R3, more comfortable than the RC 390, and lighter than the CBR500R.


Maintenance: Keeping Your Ninja 400 in Peak Condition

The Ninja 400 is notoriously low-maintenance, but here are key tips:
- Oil Changes: Every 6,000 km (3,700 miles) with SAE 10W-40. Consider synthetic blends for aggressive riding.
- Chain Care: Clean and lube the 520-chain every 500 km (310 miles). Replace sprockets (14T/41T) if teeth show wear.
- Brakes: DOT 4 fluid flush every 2 years. Swap pads when thickness drops below 3 mm (0.12").
- Cooling System: Check coolant levels annually; refill with ethylene glycol-based fluid.

MOTOPARTS.store Recommendations:
- Upgrade to a DID 520VX3 chain for longevity.
- Install sintered brake pads for improved bite.
- Consider a taller windscreen for highway comfort.


Final Thoughts

The Kawasaki Ninja 400 (2018–2022) is a masterclass in accessible performance. It’s a bike that grows with the rider—forgiving enough for beginners yet engaging enough to keep veterans entertained. Whether carving backroads or threading through traffic, this Ninja delivers grins per dollar like few others.

Ready to personalize your Ninja 400? Explore MOTOPARTS.store’s curated selection of performance upgrades, ergonomic accessories, and maintenance essentials to make your ride truly yours.

Keep the throttle twisted, and we’ll see you on the road.




Specifications sheet

Silnik
Udar: Four-stroke
Maksymalna moc: 36 kW | 48.0 hp
Maksymalny moment obrotowy: 38 Nm
Układ paliwowy: Fuel Injection (DFI® with dual 32mm throttle bodies)
Maksymalna moc @: 10000 rpm
Wyporność: 399 ccm
Maksymalny moment obrotowy @: 8000 rpm
Średnica x skok: 70.0 x 51.8 mm (2.8 x 2.0 in)
Konfiguracja: Inline
Układ chłodzenia: Liquid
Stopień sprężania: 11.5:1
Liczba cylindrów: 2
Zawory na cylinder: 4
Wymiary
Rozstaw osi: 1370 mm (53.9 in)
Waga w stanie suchym: 166
Masa na mokro: 166
Wysokość siedziska: 785 mm (30.9 in)
Szerokość całkowita: 710 mm (28.0 in)
Wysokość całkowita: 1120 mm (44.1 in)
Długość całkowita: 1990 mm (78.3 in)
Prześwit: 140 mm (5.5 in)
Pojemność zbiornika paliwa: 14 L (3.7 US gal)
Układ napędowy
Rozmiar łańcucha: 520
Napęd końcowy: chain
Długość łańcucha: 106
Skrzynia biegów: 6-speed, cable-operated wet clutch
Tylna zębatka: 41
Przednia zębatka: 14
Konserwacja
Tylna opona: 150/60-17
Olej silnikowy: 10W40
Opona przednia: 110/70-17
Płyn hamulcowy: DOT 4
Świece zapłonowe: NGK LMAR9G
Odstęp między świecami zapłonowymi: 0.7
Pojemność płynu chłodzącego: 1.3
Pojemność oleju silnikowego: 2.0
Częstotliwość wymiany oleju silnikowego: Every 5000 km or 2 years, whichever comes first
Luz zaworowy (dolot, zimny): 0.10–0.20 mm
Częstotliwość sprawdzania luzu zaworowego: 24,000 km (15,000 mi)
Luz zaworowy (wydech, zimny): 0.20–0.30 mm
Zalecane ciśnienie w oponach (tył): 2.3 bar (33 psi)
Zalecane ciśnienie w oponach (przód): 2.0 bar (29 psi)
Dodatkowe funkcje
ABS: Optional on select models
Sprzęgło: Assist & Slipper Clutch
Oprzyrządowanie: Analog tachometer, LCD screen with gear indicator, fuel gauge, and Economical Riding Indicator
Podwozie i zawieszenie
Rama: Trellis, high-tensile steel
Trail: 92 mm (3.6 in)
Hamulce tylne: Single 220mm petal disc, dual-piston caliper (ABS optional)
Hamulce przednie: Single 310mm petal disc, dual-piston caliper (ABS optional)
Tylne zawieszenie: Uni-Trak® swingarm with adjustable spring preload
Przednie zawieszenie: 41mm telescopic fork
Rake (kąt widelca): 24.7°
Skok tylnego koła: 130 mm (5.1 in)
Skok przedniego koła: 120 mm (4.7 in)






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