Adly Thunder Bike vs Yamaha YBR 125

The Yamaha YBR 125 passes its MOT first time more often than the Adly Thunder Bike — 71.0% vs 68.8%, a 2.2-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	Adly Thunder Bike	Yamaha YBR 125
First-time pass rate	68.8%	71.0%
Outright fail rate	27.5%	17.1%
Median miles at test	3,384	10,652
MOT tests analysed	109	124,897
Most common failure	steering and suspension	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.

ADLY THUNDER BIKE 68.8% pass · 109 tests YAMAHA YBR 125 71.0% pass · 125k tests

See each bike's full report — trend, mileage curve, failure breakdown and rivals — on its own page.