Z400
Before you buy
- Learner legal
- LAMS Yes, every version sold here is LAMS approved.
- Watch for
- No high- or medium-severity faults are listed for this bike.
- Running cost
- $5k–$7.5k used est. Sep 2026
Overview
The naked sibling of the Ninja 400, sharing the same 399cc parallel twin, trellis frame and trellis subframe — confirmed by the NSW register, which files it under the same code (EX400G) as the Ninja 400; Kawasaki's own code for the Z400 is ER400D. Sold in Australia in one form only, under the caps as standard, with no full-power alternative.
Engines & variants
399cc Parallel Twin (LAMS) LAMS approved
Under the caps as standard, the same way the Ninja 400 is — no ECU or mechanical restriction.
Compliance-plate model code:
ER400D or EX400G
- Victoria and Queensland list it by its Kawasaki code ER400D (QLD also has a plain "Z400" row).
- NSW files it under the Ninja 400's code EX400G, with the description "Z400 and ER400D", 2019-on, 399cc.
Pros
- Same well-proven 399cc engine and trellis frame as the Ninja 400, one of the most respected LAMS platforms in Australia
- Higher-revving powerplant than most learner naked rivals, with a genuine top-end
- Light 167kg wet weight makes it very manageable for a new rider
- Strong resale into the deep LAMS naked market
Cons
- No full-power version to move up to on the same nameplate — moving up means changing bikes entirely
- Firm, budget suspension typical of the class
- Naked riding position gives less wind protection than the faired Ninja 400 on the same engine
Known problems
unverified marks a figure we could not confirm against a manufacturer source. It is our best reading of what is published, not a checked fact — confirm it yourself before you spend money on the strength of it.
Also worth looking at
Closest in class and capacity to the Kawasaki Z400.