Kawasaki Z400J Reliability, MOT Pass Rate & Common Faults
Free Kawasaki Z400J car check
Is the Kawasaki Z400J reliable? We analysed 657 real MOT tests across 152 vehicles to find out.
Got a specific Kawasaki Z400J? Enter the reg for a free check:
The Kawasaki Z400J is above average for reliability based on real UK MOT data. Common problems include horn not working, stop lamp does not illuminate immediately a brake applies and position lamp does not illuminate immediately when switched on. Here's everything you need to know before buying a used Kawasaki Z400J.
Kawasaki Z400J Number Plates
Number plates registered to a Kawasaki Z400J. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Kawasaki Z400J MOT Pass Rate by Year
How likely is a Kawasaki Z400J to pass its MOT? Here's the pass rate for each registration year, newest first.
Kawasaki Z400J Problems — What Goes Wrong?
The most common reasons a Kawasaki Z400J fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Kawasaki Z400J Mileage — What's Normal?
How many miles does a typical Kawasaki Z400J owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Kawasaki Z400J MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Kawasaki Z400J year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1983 | 52 | 78.8% | 15,557 | 26,924 | 30,416 |
| 1982 | 152 | 79.6% | 17,770 | 36,291 | 43,100 |
| 1981 | 128 | 78.1% | 16,704 | 25,482 | 34,423 |
| 1980 | 189 | 80.4% | 20,010 | 30,231 | 41,903 |
| 1979 | 66 | 77.3% | 19,430 | 23,353 | 35,248 |
How Long Does a Kawasaki Z400J Last?
Based on 152 Kawasaki Z400J vehicles on UK roads.
Kawasaki Z400J Mileage Distribution
Total mileage recorded across all Kawasaki Z400J MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Kawasaki Z400J
Based on MOT pass rates across all registration years with sufficient test data.
80.4% MOT pass rate from 189 tests
77.3% MOT pass rate from 66 tests
The best year to buy a used Kawasaki Z400J is 1980, which has the highest MOT pass rate at 80.4% across 189 tests. The 1979 model year has the lowest pass rate at 77.3% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Kawasaki Z400J Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Kawasaki Z400J THIS CAR | 79.8% | 657 | 29,300 mi | 47 yrs |
| Kawasaki ZX-6R | 81.7% | 204,826 | 19,965 mi | 31 yrs |
| Kawasaki ZX-9R | 83.7% | 103,150 | 22,736 mi | 32 yrs |
| Kawasaki ER5 | 81.2% | 65,763 | 22,023 mi | 30 yrs |
| Proton Compact Duo | 62.8% | 705 | 67,728 mi | 28 yrs |
Compared to the Kawasaki ZX-6R (81.7% pass rate) and the Kawasaki ZX-9R (83.7% pass rate), the Kawasaki Z400J trails behind on MOT reliability.
Found a Kawasaki Z400J you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Kawasaki Z400JShould you buy a used Kawasaki Z400J?
The Kawasaki Z400J has an overall MOT pass rate of 79.8% across 657 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Kawasaki Z400J are horn not working (10 recorded failures), stop lamp does not illuminate immediately a brake applies (7), and position lamp does not illuminate immediately when switched on (7). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Kawasaki Z400J owner drives around 282 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Kawasaki Z400J models stay on UK roads for around 47 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.