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2023 Kawasaki Ninja 400 Overview
Kawasaki Ninja 400 is a sport motorcycle, displacing 399 cc. Power comes from a Four stroke, parallel twin, DOHC, 4 valves per cylinder engine, a compression ratio of 11.5:1. On the performance side, it delivers 33.4 kW of peak power and 37 Nm @ 8,000 rpm of torque. On the road, the 2023 Ninja 400 tips the scales at 168 kg, carries a 14-litre fuel tank, offers a seat height of 785 mm and spans a 1370 mm wheelbase. That's roughly 26.8 kg lighter than the average sport motorcycle in our database. The full 2023 Kawasaki Ninja 400 spec sheet below covers every technical detail, from suspension travel to tyre sizes.
2023 Kawasaki Ninja 400 compared with other bikes in the Sport category
We checked the recorded figures for the 2023 Kawasaki Ninja 400 against up to 1573 bikes in the Sport category in our database, counting each model once at the model year nearest to this one.
- Only 273 of the other 1212 bikes in the Sport category have a lighter wet weight than the 168 kg of the Ninja 400.
- With 33.4 kW, the Ninja 400 has the 307th lowest power output of 1341 bikes in the Sport category, 56% below the category average of 75.3 kW.
- Torque of 37 Nm is lower than that of 1194 of the other 1572 bikes in the Sport category.
- Narrowing the field to the 387 models within five model years of it, the wet weight of 168 kg is lighter than that of 313 of the other 386.
2023 Ninja 400 - Pros & Cons
Strengths
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Strong power output: With 33.4 kW and 37 Nm @ 8,000 rpm of torque on tap, the Ninja 400 is no slouch for its class.
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Strong front braking: Stopping power up front is strong thanks to the disc setup, with plenty of room to upgrade further with braided lines.
Considerations
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Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.
Wear Points & Servicing Notes
Cooling system servicing
Ninja 400's Liquid cooled setup is low-maintenance provided the coolant interval is kept - old, acidic coolant is the main cause of long-term corrosion in the water passages.
Brake disc and pad wear
Braking up front comes from single 310mm semi-floating petal disc with Caliper: Single balanced actuation dual piston - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.
Suspension condition on used examples
The Ninja 400's suspension runs 41mm Telescopic fork at the front. The rear uses Bottom-Link Uni-Trak, gas-charged shock with adjustable preload. Fork-seal condition and rear linkage play are the two things worth checking before buying used.
Final drive maintenance
The Ninja 400 uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.
Frame & chassis check
Built around a Trellis, high-tensile steel, the Ninja 400's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.
Ninja 400 - Buying & Maintenance Guide
What to check before buying
Before handing over money for a used 2023 Kawasaki Ninja 400 with its 399 cc sport, cover the fundamentals: service book and oil change history, drivetrain wear, and any sign of oil weeping around the casings. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 3 years old, this sport is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. Cold-starting it yourself tells you a lot - a healthy Ninja 400 should catch quickly and settle into a smooth idle.
Oil and filter changes
Nothing protects the Ninja 400's 399 cc four stroke, parallel twin, dohc, 4 valves per cylinder like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). With an 11.5:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Match the viscosity grade to what the owner's manual specifies, not what's cheapest.
Carburetor upkeep
Deposits in the carbs are the usual culprit behind poor running on a stored Ninja 400 - strip and clean the float bowls before the first start. Pilot jets clog first and get overlooked most, so make a point of checking them.
2023 Kawasaki Ninja 400 - Frequently Asked Questions
What engine does the 2023 Kawasaki Ninja 400 have?
The 2023 Kawasaki Ninja 400 uses a Four stroke, parallel twin, DOHC, 4 valves per cylinder engine with 399 cc of displacement. It is liquid cooled.
How much does the 2023 Kawasaki Ninja 400 weigh?
The 2023 Kawasaki Ninja 400 weighs 168 kg. This is the manufacturer's wet figure.
How much power does the 2023 Kawasaki Ninja 400 make?
The 2023 Kawasaki Ninja 400 produces 33.4 kW of power and 37 Nm @ 8,000 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2023 Kawasaki Ninja 400?
The 2023 Kawasaki Ninja 400 has a 14-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 233-280 km between stops.
Is the 2023 Kawasaki Ninja 400 suitable for shorter riders?
The 2023 Kawasaki Ninja 400 has a seat height of 785 mm. This is a moderate seat height that suits a wide range of rider heights.
What brakes does the 2023 Kawasaki Ninja 400 have?
The 2023 Kawasaki Ninja 400 uses single 310mm semi-floating petal disc with Caliper: Single balanced actuation dual piston at the front and single 220 mm petal disc with Caliper: Dual-piston at the rear.
What tyre sizes does the 2023 Kawasaki Ninja 400 use?
The 2023 Kawasaki Ninja 400 runs 110/70R17 M/C 54 H front and 150/60R17 M/C 66 H rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2023 Kawasaki Ninja 400 have?
The 2023 Kawasaki Ninja 400 is fitted with a 6 Speed transmission.
Key Specifications
Engine
Four stroke, parallel twin, DOHC, 4 valves per cylinder
Power
33.4 kW / 45 hp @10000 rpm
Torque
37 Nm / 27.3 lb-ft @ 8,000 rpm
Weight
168 kg / 370.3 lbs
Fuel Capacity
14 Litres / 3.7 US gal
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Full 2023 Kawasaki Ninja 400 Specifications
Year
2023
Make Model
Kawasaki Ninja 400
Seat Height
785 mm / 30.9 in
Wheelbase
1370 mm / 53.9 in
Ground Clearance
140 mm / 5.5 in
Height
1120 mm / 44.0 in
Length
1990 mm / 78.3 in
Width
710 mm / 27.9 in
Fuel Capacity
14 Litres / 3.7 US gal
Wet Weight
168 kg / 370.3 lbs
Displacement
399 cc / 24.3 cu-in
Engine Detail
Four stroke, parallel twin, DOHC, 4 valves per cylinder
Bore x Stroke
70 x 51.8 mm
Compression Ratio
11.5:1
Cooling System
Liquid cooled
Emissions
EURO5
Fuel Induction
DFI with 32mm x 2 throttle bodies
Ignition
TCBI with digital advance
Lubrication
Forced lubrication, wet sump
Starter
Electric
Clutch
Wet multi-disc, manual
Final Drive
Chain
Final Drive Ratio
2.929 (41/14)
Gear Ratios
1st 2.929 (41/14) 2nd 2.056 (37/18) 3rd 1.619 (34/21) 4th 1.333 (32/24) 5th 1.154 (30/26) 6th 1.037 (28/27)
Primary Drive Ratios
2.219 (71/32)
Transmission / Drive
6 Speed
Frame Type
Trellis, high-tensile steel
Suspension - Front
41mm Telescopic fork
Suspension - Rear
Bottom-Link Uni-Trak, gas-charged shock with adjustable preload
Rake
24.5°
Trail
92 mm / 3.7 in
Wheel Travel - Front
120 mm / 4.7 in
Wheel Travel - Rear
130 mm / 5.1 in
Brakes - Front
Single 310mm semi-floating petal disc. Caliper: Single balanced actuation dual piston
Brakes - Rear
Single 220 mm petal disc. Caliper: Dual-piston
ABS
Standard
Tyres - Front
110/70R17 M/C 54 H
Tyres - Rear
150/60R17 M/C 66 H
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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