TGB BR8 R125X vs Yamaha YBR 125

The Yamaha YBR 125 passes its MOT first time more often than the TGB BR8 R125X: 71.0% vs 70.0%, a 1.0-point lead.

MOT reliability, side by side

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

Metric	TGB BR8 R125X	Yamaha YBR 125
First-time pass rate	70.0%	71.0%
Outright fail rate	24.2%	17.1%
Vs comparable bikes (age & mileage adjusted)	-2.4 pts	-1.1 pts
Engine size	124cc	124cc
Rank among all models	#4735 of 5428	#4664 of 5428
Median miles at test	7,743	10,652
MOT tests analysed	480	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.

"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.

Pass rate by test year

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

Test year	TGB BR8 R125X	Yamaha YBR 125
2013	76.2%	69.5%
2014	73.1%	70.0%
2015	66.4%	71.2%
2016	79.2%	71.3%
2017	56.5%	70.7%
2018	64.5%	72.0%

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	TGB BR8 R125X	Yamaha YBR 125
0k-10k miles	74.7%	76.8%
10k-20k miles	57.4%	67.4%

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

TGB BR8 R125X 70.0% pass · 480 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.