Data as of: DVSA MOT results to 2025
Ajs JS 125-E2 vs Gilera Runner
The Gilera Runner passes its MOT first time more often than the Ajs JS 125-E2: 70.8% vs 69.1%, a 1.7-point lead.
MOT reliability, side by side
| Metric | Ajs JS 125-E2 | Gilera Runner |
|---|---|---|
| First-time pass rate | 69.1% | 70.8% |
| Outright fail rate | 20.4% | 21.5% |
| Vs comparable bikes (age & mileage adjusted) | -2.9 pts | -0.7 pts |
| Engine size | 124cc | 124cc |
| Rank among all models | #4796 of 5428 | #4675 of 5428 |
| Median miles at test | 10,207 | 11,381 |
| MOT tests analysed | 1,187 | 69,850 |
| Most common failure | brakes | lighting and signalling |
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 | Ajs JS 125-E2 | Gilera Runner |
|---|---|---|
| Lights & signalling | 11.9% | 12.3% |
| Steering & suspension | 7.1% | 10.6% |
| Brakes | 8.0% | 7.2% |
| Tyres & wheels | 5.3% | 5.1% |
| Structure & body | 4.8% | 2.0% |
| Drive system | 3.6% | 0.0% |
| Fuel & exhaust | 0.6% | 2.6% |
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 test year
| Test year | Ajs JS 125-E2 | Gilera Runner |
|---|---|---|
| 2017 | 65.5% | 76.1% |
| 2018 | 65.6% | 77.2% |
| 2019 | 77.5% | 77.0% |
| 2020 | 71.4% | 75.8% |
| 2021 | 69.2% | 79.1% |
| 2022 | 61.8% | 80.5% |
| 2023 | 74.1% | 81.3% |
| 2025 | 73.3% | 85.5% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Pass rate by mileage
| Mileage | Ajs JS 125-E2 | Gilera Runner |
|---|---|---|
| 0k-10k miles | 77.8% | 76.2% |
| 10k-20k miles | 63.3% | 67.5% |
| 20k-30k miles | 59.9% | 65.4% |
| 30k-40k miles | 54.2% | 67.2% |
Bands with fewer than 30 tests for either bike are left out.
Ajs JS 125-E2 vs Gilera Runner FAQ
Which is more reliable, the Ajs JS 125-E2 or the Gilera Runner?
The Gilera Runner passes its MOT first time more often than the Ajs JS 125-E2: 70.8% vs 69.1%, a 1.7-point lead. Adjusted for age, mileage and test class, the Gilera Runner still comes out ahead: -2.9 points vs comparable bikes for the Ajs JS 125-E2, -0.7 for the Gilera Runner. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Ajs JS 125-E2 fail its MOT on most?
Lights & signalling: 11.9% of Ajs JS 125-E2 MOT tests failed on it, then brakes (8.0%).
What does the Gilera Runner fail its MOT on most?
Lights & signalling: 12.3% of Gilera Runner MOT tests failed on it, then steering & suspension (10.6%).
Which holds up better at high mileage, the Ajs JS 125-E2 or the Gilera Runner?
At 30k-40k miles the Gilera Runner passes first time more often: 54.2% for the Ajs JS 125-E2 vs 67.2% for the Gilera Runner.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.