Baotian BT 125 T-21 vs Yamaha YBR 125

The Yamaha YBR 125 passes its MOT first time more often than the Baotian BT 125 T-21: 71.0% vs 66.7%, a 4.3-point lead.

MOT reliability, side by side

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

Metric	Baotian BT 125 T-21	Yamaha YBR 125
First-time pass rate	66.7%	71.0%
Outright fail rate	27.3%	17.1%
Vs comparable bikes (age & mileage adjusted)	-7.7 pts	-1.1 pts
Engine size	125cc	124cc
Rank among all models	#4925 of 5428	#4664 of 5428
Median miles at test	5,986	10,652
MOT tests analysed	888	124,897
Most common failure	lighting and signalling	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	Baotian BT 125 T-21	Yamaha YBR 125
Lights & signalling	14.6%	8.5%
Steering & suspension	9.9%	6.5%
Brakes	8.1%	5.9%
Tyres & wheels	9.3%	4.4%
Structure & body	2.4%	3.8%
Drive system	0%	2.9%
Fuel & exhaust	0.9%	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	Baotian BT 125 T-21	Yamaha YBR 125
2016	67.4%	71.3%
2017	63.9%	70.7%
2018	66.2%	72.0%
2019	73.4%	71.8%
2020	61.9%	73.4%
2021	63.5%	71.6%
2022	64.1%	71.3%
2023	73.3%	71.1%

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	Baotian BT 125 T-21	Yamaha YBR 125
0k-10k miles	71.3%	76.8%
10k-20k miles	54.0%	67.4%

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

Baotian BT 125 T-21 vs Yamaha YBR 125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Baotian BT 125 T-21 or the Yamaha YBR 125?

The Yamaha YBR 125 passes its MOT first time more often than the Baotian BT 125 T-21: 71.0% vs 66.7%, a 4.3-point lead. Adjusted for age, mileage and test class, the Yamaha YBR 125 still comes out ahead: -7.7 points vs comparable bikes for the Baotian BT 125 T-21, -1.1 for the Yamaha YBR 125. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Baotian BT 125 T-21 fail its MOT on most?

Lights & signalling: 14.6% of Baotian BT 125 T-21 MOT tests failed on it, then steering & suspension (9.9%).

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%).

BAOTIAN BT 125 T-21 66.7% pass · 888 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.