Motorcycles | Kawasaki Sportbike Maintenance Schedules

Kawasaki Ninja 400 (EX400) Maintenance Schedule

2021 Kawasaki Ninja 400 KRT left hand diagonal

This is the full maintenance schedule for the Kawasaki Ninja 400 — when to change your air filter, spark plugs, and more.

The Ninja 400 was the successor to the Ninja 300, but it was better in every way. Well, in two important ways — it’s more powerful, and lighter.

The Ninja 400 is still an entry-level bike but is the kind of bike many people find themselves downsizing to and having the time of their lives on it. It’s powered by a 399cm dual overhead cam water-cooled parallel twin, putting its power down through a chain drive.

This site has links to Amazon for things like oil and spark plugs from which we earn a commission (which unfortunately nobody can save, not even us). If you appreciate this work, then please use those links to buy your oil, spark plugs, etc.

What you need to service your Kawasaki Ninja 400

Servicing your Ninja 400 is easy! You just need a bunch of basic motorcycle maintenance tools, some floor space, and of course the following consumables.

PartKawasaki Ninja 400 & Z400 Spec
OilYou need 2.0L (2.1 US qt) of SAE 10W-40 engine oil “with API SG, SH, SJ, SL or SM with JASO MA, MA1 or MA2 rating”, preferably Kawasaki 10W-40 Engine Oil, or another multigrade synthetic like Motul 7100 or Mobil 1 Synthetic

Don’t over-torque the drain bolt (spec is 30 Nm/22 lb-ft per the manual) — use a torque wrench if you don’t have experience with how much torque is enough.
Oil filterOil filter is part 16097-0008, or you can use Hiflofiltro HF303RC. Torque for oil filter is 17.5 Nm (12.9 ft-lb) (use a torque wrench, and it’s easier on the aftermarket one)
Front brake padsGenuine part number for front brake pads is 43082-0081 for Ninja or Z 300/400. Get double-sintered EBC brake pads for better bite and wear — code FA197HH.
Rear brake padsGenuine part number for rear brake pads is 43082-0128 (or same as front… same pads!). Get double-sintered EBC brake pads for better bite and wear — code FA197HH.
Spark plugsNGK LMAR9G, with a spark plug gap of 0.7-0.8mm, torqued to 13 Nm or 9 ft-lb (use a torque wrench)
Air filterUse the K&N air filter KA-4018.
Cable lubricantRemember to lubricate your clutch cable (and brake cables if you have them) with a cable lubricant. Protect All Cable Life is a good general-purpose lubricant.
Chain lubricantThe chain needs to be lubricated every 600 km/400 miles (or more, if it gets wet/dirty). Motul chain paste is cheap and well-loved.
Brake fluidSpec is to use DOT-4 brake fluid.
CoolantUse nitrate-free, phosphate-free, ethylene glycol-based coolant with anti-corrosion inhibitors, e.g. Valvoline Zerex G05
GreaseUse a lithium soap-based grease for all the important greasing points.
Consumables for servicing the Kawasaki Ninja 400 & Z400 motorcycle

Maintenance schedule for the Kawasaki Ninja 400

Below is the full maintenance schedule for the Ninja 400.

Notes on letters used:

  • I = Inspect
  • R = Replace
  • L = Lubricate
  • (C) Service more frequently in severe conditions: dusty, wet, muddy, high speed, or frequent starting/stopping
ItemsYear(s)1000 km (600 mi)12000 km (7600 mi)24000 km (15200 mi)36000 km (22800 mi)48000 km (30400 mi)
Air cleaner element (*C) (KA-4018)RRRR
Idle speedIIIII
Throttle control system (play, smooth return, no drag)I,1IIIII
Engine vacuum synchronizationIIII
Fuel systemI,1IIIII
Fuel filterRR
Fuel hosesR,5
Evaporative emission control system (CA only)II
Coolant level (Zerex G05)I,1IIIII
Cooling systemI,1IIIII
Coolant, water hoses, and O-ringsR,3R
Valve clearanceII
Air suction systemIIII
Clutch operation (play, engagement, disengagement)I,1IIIII
Engine oil(*C) and oil filter (Motul 5100, HF303RC)R,1RRRRR
Tire air pressureI,1IIII
Wheels and tiresI,1IIII
Wheel bearing damageI,1IIII
Drive chain lubrication condition (*C) (Motul chain care kit)I, Every 600 km (400 mi)
Drive chain slack (*C)I, Every 1000 km (600 mi)
Drive chain wear (*C)IIII
Drive chain guide wearIIII
Brake systemI,1IIIII
Brake operation (effectiveness, play, no drag)I,1IIIII
Brake fluid levelI,1IIIII
Brake fluid (front and rear) (DOT 4 only)R,2RR
Brake hoseR,4
Rubber parts of brake master cylinder and caliperR,4R
Brake pad wear (*C)I,1IIII
Brake light switch operationI,1IIIII
Suspension systemI,1IIII
Lubrication of rear suspensionLL
Steering playI,1IIIII
Steering stem bearingsL,2LL
Electrical systemI,1IIII
Spark plug (LMAR9G)RRRR
Chassis partsL,1LLLL
Condition of bolts, nuts, and fastenersIIIII
Kawasaki Ninja 400 (EX400) Maintenance Schedule

Tyre sizes and pressures for the Ninja 400

The manual specifies the following tire sizes, pressures, and brands (that it ships with, though people rarely stick with them).

TyreSizeTyre pressure (cold)Brand(s) shipped with
Front110/70R17 M/C 54H200 kPa/28 psiDUNLOP, SPORTMAX, GPR -300F N
Rear150/60R17 M/C 66H225 kPa/32 psiDUNLOP, SPORTMAX, GPR -300 N
Tyres and tyre pressures

About the Ninja 400

The Ninja 400 was first released in 2018 (launched a few months earlier), replacing the Ninja 300 that was itself an improvement on the long-lived and much-loved Ninja 250.

It’s a very well loved beginner motorcycle, but also with a few mods makes a great entry-level track motorcycle that is suitable for tighter circuits that don’t really give big bikes the advantage on long straights. (The first mod anyone makes when going to the track, by the way, is modifying the suspension — gold valve emulators or cartridges up front.)

The 399cc water-cooled parallel twin doesn’t make a terribly inspiring sound, as you’d expect from a small engine with a 180 degree crank. It’s a far cry from the lively bark of the CP2 engine in the MT-07, for example.

But what it doesn’t have in character it makes up for in revviness and willingness to fly way up the tachometer to high RPMs. This is where the Ninja 400 is different to competitors like the Honda CBR500R. On paper they have similar specs, though the Ninja is heavier. But in reality, the CBR500R seems to run out of puff when the little 400 keeps going.

The Ninja 400 is still a great everyday motorcycle, though. It is comfortable, with high clip-on style handlebars, and doesn’t force you to crouch way down over the tank. They come standard with ABS in most markets (or with it as an option for pennies more), are frugal on gas, and very low on maintenance — see above, if you don’t believe us, with maintenance intervals every 12,000 km (7,500 mi) and mostly requiring “inspecting” things.

In fact, the Ninja 400 is such a practical, fun motorcycle, that it’s a popular target for people who decide they’ve had enough of pottering around on superbikes and want something they can really fly with. It’s a real rider’s bike, for the right kind of roads.

Just keep the fluids up to date, check the valves, replace brakes pads and the chain occasionally, and it’ll go forever… until you crash it.

Manual for the Kawasaki Ninja 400

The above maintenance schedule was copied from the manual for the Ninja 400.

Kawasaki Ninja 400 maintenance schedule
Kawasaki Ninja 400 maintenance schedule screenshot

You can download it from Kawasaki’s website here.

Similar Posts