Data as of: DVSA MOT results to 2025
Piaggio ET4 vs Yamaha Nmax 125
The Yamaha Nmax 125 passes its MOT first time more often than the Piaggio ET4: 82.2% vs 74.3%, a 7.9-point lead.
MOT reliability, side by side
| Metric | Piaggio ET4 | Yamaha Nmax 125 |
|---|---|---|
| First-time pass rate | 74.3% | 82.2% |
| Outright fail rate | 16.8% | 11.4% |
| Vs comparable bikes (age & mileage adjusted) | +2.8 pts | +9.5 pts |
| Engine size | 124cc | 125cc |
| Rank among all models | #4371 of 5428 | #3145 of 5428 |
| Median miles at test | 11,927 | 30,236 |
| MOT tests analysed | 987 | 33,779 |
| Most common failure | lighting and signalling | brakes |
First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.
"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.
What fails, side by side
| Component | Piaggio ET4 | Yamaha Nmax 125 |
|---|---|---|
| Lights & signalling | 9.2% | 4.2% |
| Steering & suspension | 6.0% | 5.0% |
| Brakes | 5.4% | 5.3% |
| Tyres & wheels | 6.7% | 3.7% |
| Structure & body | 1.6% | 0.6% |
| Fuel & exhaust | 1.8% | 0% |
A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.
Pass rate by mileage
| Mileage | Piaggio ET4 | Yamaha Nmax 125 |
|---|---|---|
| 0k-10k miles | 79.7% | 90.9% |
| 10k-20k miles | 71.5% | 84.2% |
| 20k-30k miles | 71.3% | 81.9% |
| 30k-40k miles | 65.1% | 79.2% |
Bands with fewer than 30 tests for either bike are left out.
Piaggio ET4 vs Yamaha Nmax 125 FAQ
Which is more reliable, the Piaggio ET4 or the Yamaha Nmax 125?
The Yamaha Nmax 125 passes its MOT first time more often than the Piaggio ET4: 82.2% vs 74.3%, a 7.9-point lead. Adjusted for age, mileage and test class, the Yamaha Nmax 125 still comes out ahead: +2.8 points vs comparable bikes for the Piaggio ET4, +9.5 for the Yamaha Nmax 125. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Piaggio ET4 fail its MOT on most?
Lights & signalling: 9.2% of Piaggio ET4 MOT tests failed on it, then tyres & wheels (6.7%).
What does the Yamaha Nmax 125 fail its MOT on most?
Brakes: 5.3% of Yamaha Nmax 125 MOT tests failed on it, then steering & suspension (5.0%).
Which holds up better at high mileage, the Piaggio ET4 or the Yamaha Nmax 125?
At 30k-40k miles the Yamaha Nmax 125 passes first time more often: 65.1% for the Piaggio ET4 vs 79.2% for the Yamaha Nmax 125.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.