Kawasaki Z400 ER400 (2018+) Maintenance Schedule

This is the full maintenance schedule for the Kawasaki Z400 (2018+) — when to change your air filter, spark plugs, and more. It’s also known as the ER400 or the Z400 ABS, though ABS is standard.

The Z400 is the successor to the Kawasaki Z300, but it is a superior motorcycle in every way. It’s more powerful AND it’s lighter. It shares a basic platform with the Kawasaki Ninja 400, but it is the naked version — so it’s more suited to everyday riding, and easier to work on (fewer fairing panels to remove).

The core of the Kawasaki Z400 is a 399 cc liquid-cooled parallel twin. It’s a thoroughly modern engine — with dual over-head cams and four valves per cylinder, and with a fairly high compression ratio of 11.5:1. The Z400, like its Ninja stablemate, makes peak power of 33 kW (45 hp) at 10000 rpm, and peak torque of 37 Nm (50 ft-lb) at 8000 rpm. So it has plenty of pull, but you need to rev it up to get there.

Final drive for the Kawasaki Z400 is via a 6-speed transmission and a chain drive.

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What you need to service your Kawasaki Z400

Servicing your Z400 is even easier than servicing your Ninja 400, as you have fewer fairing panels to remove! 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 Z400

Below is the full maintenance schedule for the Z400.

In the original manual, some items are mentioned as “dealer inspection”. Things like checking the idle speed or the coolant level. However, the bike is easy to service — it’s up to you if you want to take it to a dealer or not.

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
km x 1000112243648
mi x 1000Every0.67.615.222.830.4
Air cleaner element (*C) (K&N KA-4018)RRRR
Idle speedIIIII
Throttle control system (play, smooth return, no drag)I,1 yearIIIII
Engine vacuum synchronizationIIII
Fuel systemI,1 yearIIIII
Fuel filterRR
Fuel hoseR,5 years
Evaporative emission control system (CA only)II
Coolant level (Zerex G05)I,1 yearIIIII
Cooling systemI,1 yearIIIII
Coolant, water hoses, and O-ringsR,3 yearsR
Valve clearanceII
Air suction systemIIII
Clutch operation (play, engagement, disengagement)I,1 yearIIIII
Engine oil(*C) and oil filter (Kawasaki 10W-40 Engine oil or Motul 7100 + HF303RC)R,1 yearRRRRR
Tire air pressureI,1 yearIIII
Wheels and tiresI,1 yearIIII
Wheel bearing damageI,1 yearIIII
Drive chain lubrication condition (*C) (Motul chain care kit)I, 600 km (400 mi)
Drive chain slack (*C)I, 1000 km (600 mi)
Drive chain wear (*C)IIII
Drive chain guide wearIIII
Brake systemI,1 yearIIIII
Brake operation (effectiveness, play, no drag)I,1 yearIIIII
Brake fluid levelI,1 yearIIIII
Brake fluid (front and rear) (DOT 4 only)R,2 yearsRR
Brake hoseR,4 years
Rubber parts of brake master cylinder and caliperR,4 yearsR
Brake pad wear (*C)I,1 yearIIII
Brake light switch operationI,1 yearIIIII
Suspension systemI,1 yearIIII
Lubrication of rear suspensionLL
Steering playI,1 yearIIIII
Steering stem bearingsL,2 yearsLL
Electrical systemI,1 yearIIII
Spark plug (NGK LMAR9G)RRRR
Chassis partsL,1 yearLLLL
Condition of bolts, nuts, and fastenersIIIII
Kawasaki Z400 Maintenance Schedule

Tyre sizes and pressures for the Kawasaki Z400

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 for the Z400

About the Kawasaki Z400

2020 Kawasaki Z400 Static RHS Orange

The Kawasaki Z400 was first released in 2018 (launched a few months earlier), replacing the Kawasaki Z300, which was a similar motorcycle (a standard version of its stablemate the Ninja 300).

Like its stablemate, the Z400 is a very well loved beginner motorcycle. It’s not as favoured a track weapon as the Ninja 400 — fairings are useful for the higher speeds, especially with the relatively lower power output of the engine (compared to everyone else’s liter-bikes on the track!)

The 399cc water-cooled parallel twin in the Z400 doesn’t make a terribly inspiring sound, as you’d expect from a small engine with a 180 degree crank. It’s not a bike you’d bother putting an aftermarket exhaust onto.

But what the engine lacks in character it makes up for in revviness and willingness to fly way up the tachometer to high RPMs. This is where the Z400 is different to competitors like the Honda CB500F. On paper, they have similar specs in terms of power. But the Z400 likes to rev — it puts out its peak power at 9,940 rpm, and peak torque at 8,270 rpm. This gives it a lively feeling and is a bike you can really get a lot out of in everyday riding without breaking the speed limit.

On top of that, the Kawasaki Z400 is very lightweight – in fact, lighter than the 300 cc bike that it replaces. You feel this as soon as you’re on the bike. Get it to race spec and you can expect to drop even more.

The Z400 is a great everyday motorcycle, too. It is comfortable, with high handlebars that only lean you forward a little. It comes with ABS as standard, unlike the Ninja 400 which asks you to pay a little more for it. And the Z400 is slightly cheaper. So if you don’t need (or want) those fairings, then opt for the Z.

Suspension and braking on the Z400 are simple and competent. There’s a single front disc, and only preload adjustability, but it gets the job done.

2021 Kawasaki ER400 Z400 Green action LHS

The Kawasaki Z400 is easy to maintain, too. Most maintenance intervals just ask you to “check” things — the only things to replace regularly are the oil, and periodically some of the other vital fluids like brake fluid. In fact, the Z400 is such a great everyday sportbike that many people downsize to it from bigger bikes.

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 Z400

Kawasaki Z400 maintenance schedule screenshot from manual
Kawasaki Z400 maintenance schedule screenshot from manual

The above maintenance schedule was transcribed from the manual for the Z400.

You can download it from Kawasaki’s website here.

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