BMW C1 vs Yamaha YBR 125

The BMW C1 passes its MOT first time more often than the Yamaha YBR 125: 77.7% vs 71.0%, a 6.7-point lead.

MOT reliability, side by side

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

Metric	BMW C1	Yamaha YBR 125
First-time pass rate	77.7%	71.0%
Outright fail rate	17.8%	17.1%
Vs comparable bikes (age & mileage adjusted)	+6.4 pts	-1.1 pts
Engine size	125cc	124cc
Rank among all models	#3952 of 5428	#4664 of 5428
Median miles at test	14,676	10,652
MOT tests analysed	8,766	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.

"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

share of each bike's MOT tests that failed on the component · lower is better

Component	BMW C1	Yamaha YBR 125
Lights & signalling	7.5%	8.5%
Steering & suspension	8.8%	6.5%
Brakes	7.5%	5.9%
Tyres & wheels	4.3%	4.4%
Structure & body	0.6%	3.8%
Drive system	0%	2.9%
Fuel & exhaust	0.2%	0.6%

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

first-time MOT pass rate in each calendar year both bikes were tested

Test year	BMW C1	Yamaha YBR 125
2018	79.8%	72.0%
2019	82.1%	71.8%
2020	87.9%	73.4%
2021	87.0%	71.6%
2022	83.3%	71.3%
2023	85.9%	71.1%
2024	85.3%	70.9%
2025	94.0%	71.2%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	BMW C1	Yamaha YBR 125
0k-10k miles	86.0%	76.8%
10k-20k miles	76.0%	67.4%
20k-30k miles	71.7%	63.8%
30k-40k miles	74.1%	62.2%
40k-50k miles	69.5%	63.4%
50k-60k miles	66.7%	63.6%

Bands with fewer than 30 tests for either bike are left out.

BMW C1 vs Yamaha YBR 125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the BMW C1 or the Yamaha YBR 125?

The BMW C1 passes its MOT first time more often than the Yamaha YBR 125: 77.7% vs 71.0%, a 6.7-point lead. Adjusted for age, mileage and test class, the BMW C1 still comes out ahead: +6.4 points vs comparable bikes for the BMW C1, -1.1 for the Yamaha YBR 125. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the BMW C1 fail its MOT on most?

Steering & suspension: 8.8% of BMW C1 MOT tests failed on it, then lights & signalling (7.5%).

What does the Yamaha YBR 125 fail its MOT on most?

Lights & signalling: 8.5% of Yamaha YBR 125 MOT tests failed on it, then steering & suspension (6.5%).

Which holds up better at high mileage, the BMW C1 or the Yamaha YBR 125?

At 50k-60k miles the BMW C1 passes first time more often: 66.7% for the BMW C1 vs 63.6% for the Yamaha YBR 125.

BMW C1 77.7% pass · 8,766 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.