Head-to-head · 2005–2025
Data as of: DVSA MOT results to 2025
Ajs DD100E vs Yamaha YBR 125
The Ajs DD100E passes its MOT first time more often than the Yamaha YBR 125: 72.6% vs 71.0%, a 1.6-point lead.
MOT reliability, side by side
first-time pass rate, outright fail rate and tests analysed · 2005–2025
| Metric | Ajs DD100E | Yamaha YBR 125 |
|---|---|---|
| First-time pass rate | 72.6% | 71.0% |
| Outright fail rate | 20.3% | 17.1% |
| Vs comparable bikes (age & mileage adjusted) | -6.4 pts | -1.1 pts |
| Engine size | 98cc | 124cc |
| Median miles at test | 3,217 | 10,652 |
| MOT tests analysed | 197 | 124,897 |
| 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.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.