White Knuckle 125 Sport vs Yamaha YBR 125

The Yamaha YBR 125 passes its MOT first time more often than the White Knuckle 125 Sport — 71.0% vs 50.4%, a 20.6-point lead.

MOT reliability, side by side

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

Metric	White Knuckle 125 Sport	Yamaha YBR 125
First-time pass rate	50.4%	71.0%
Outright fail rate	37.0%	17.1%
Median miles at test	7,099	10,652
MOT tests analysed	486	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.

WHITE KNUCKLE 125 SPORT 50.4% pass · 486 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.