Head-to-head · 2005–2025
WK Bikes SX 125 vs Yamaha YBR 125
The Yamaha YBR 125 passes its MOT first time more often than the WK Bikes SX 125 — 71.0% vs 68.6%, a 2.4-point lead.
MOT reliability, side by side
first-time pass rate, outright fail rate and tests analysed · 2005–2025
| Metric | WK Bikes SX 125 | Yamaha YBR 125 |
|---|---|---|
| First-time pass rate | 68.6% | 71.0% |
| Outright fail rate | 21.6% | 17.1% |
| Median miles at test | 5,614 | 10,652 |
| MOT tests analysed | 236 | 124,897 |
| Most common failure | brakes | 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.
See each bike's full report — trend, mileage curve, failure breakdown and rivals — on its own page.