Data as of: DVSA MOT results to 2025
Yamaha DT50 vs Peugeot Speedfight
The Peugeot Speedfight passes its MOT first time more often than the Yamaha DT50: 65.2% vs 60.5%, a 4.7-point lead.
MOT reliability, side by side
| Metric | Yamaha DT50 | Peugeot Speedfight |
|---|---|---|
| First-time pass rate | 60.5% | 65.2% |
| Outright fail rate | 27.7% | 26.3% |
| Vs comparable bikes (age & mileage adjusted) | -13.8 pts | -5.3 pts |
| Engine size | 49cc | 49cc |
| Rank among all models | #5195 of 5428 | #5008 of 5428 |
| Median miles at test | 17,837 | 13,547 |
| MOT tests analysed | 2,974 | 83,728 |
| Most common failure | lighting and signalling | 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 | Yamaha DT50 | Peugeot Speedfight |
|---|---|---|
| Lights & signalling | 21.6% | 15.4% |
| Steering & suspension | 14.7% | 12.9% |
| Brakes | 9.1% | 10.8% |
| Tyres & wheels | 6.3% | 4.7% |
| Drive system | 6.2% | 0.0% |
| Fuel & exhaust | 3.7% | 2.5% |
| Structure & body | 3.9% | 2.3% |
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 | Yamaha DT50 | Peugeot Speedfight |
|---|---|---|
| 2018 | 70.3% | 69.6% |
| 2019 | 71.1% | 68.9% |
| 2020 | 64.5% | 72.0% |
| 2021 | 78.2% | 71.0% |
| 2022 | 71.8% | 71.7% |
| 2023 | 78.6% | 71.0% |
| 2024 | 75.4% | 72.9% |
| 2025 | 71.7% | 74.0% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Pass rate by mileage
| Mileage | Yamaha DT50 | Peugeot Speedfight |
|---|---|---|
| 0k-10k miles | 61.7% | 73.1% |
| 10k-20k miles | 60.0% | 63.3% |
| 20k-30k miles | 58.6% | 58.2% |
| 30k-40k miles | 64.6% | 56.6% |
| 40k-50k miles | 56.3% | 58.2% |
Bands with fewer than 30 tests for either bike are left out.
Yamaha DT50 vs Peugeot Speedfight FAQ
Which is more reliable, the Yamaha DT50 or the Peugeot Speedfight?
The Peugeot Speedfight passes its MOT first time more often than the Yamaha DT50: 65.2% vs 60.5%, a 4.7-point lead. Adjusted for age, mileage and test class, the Peugeot Speedfight still comes out ahead: -13.8 points vs comparable bikes for the Yamaha DT50, -5.3 for the Peugeot Speedfight. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the Yamaha DT50 fail its MOT on most?
Lights & signalling: 21.6% of Yamaha DT50 MOT tests failed on it, then steering & suspension (14.7%).
What does the Peugeot Speedfight fail its MOT on most?
Lights & signalling: 15.4% of Peugeot Speedfight MOT tests failed on it, then steering & suspension (12.9%).
Which holds up better at high mileage, the Yamaha DT50 or the Peugeot Speedfight?
At 40k-50k miles the Peugeot Speedfight passes first time more often: 56.3% for the Yamaha DT50 vs 58.2% for the Peugeot Speedfight.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.