Aprilia RS 125 11KW vs Yamaha YBR 125

The Yamaha YBR 125 passes its MOT first time more often than the Aprilia RS 125 11KW: 71.0% vs 58.1%, a 12.9-point lead.

MOT reliability, side by side

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

Metric	Aprilia RS 125 11KW	Yamaha YBR 125
First-time pass rate	58.1%	71.0%
Outright fail rate	31.2%	17.1%
Vs comparable bikes (age & mileage adjusted)	-11.1 pts	-1.1 pts
Engine size	125cc	124cc
Rank among all models	#5273 of 5428	#4664 of 5428
Median miles at test	13,932	10,652
MOT tests analysed	731	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	Aprilia RS 125 11KW	Yamaha YBR 125
Lights & signalling	17.1%	8.5%
Steering & suspension	15.9%	6.5%
Brakes	12.3%	5.9%
Drive system	7.7%	2.9%
Tyres & wheels	5.3%	4.4%
Structure & body	4.8%	3.8%
Fuel & exhaust	2.5%	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	Aprilia RS 125 11KW	Yamaha YBR 125
2010	61.8%	71.4%
2011	47.5%	69.1%
2012	49.4%	69.1%
2013	68.1%	69.5%
2014	58.9%	70.0%
2015	53.1%	71.2%
2016	54.4%	71.3%
2017	50.0%	70.7%

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	Aprilia RS 125 11KW	Yamaha YBR 125
0k-10k miles	63.8%	76.8%
10k-20k miles	58.7%	67.4%
20k-30k miles	51.7%	63.8%
30k-40k miles	46.9%	62.2%

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

Aprilia RS 125 11KW vs Yamaha YBR 125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Aprilia RS 125 11KW or the Yamaha YBR 125?

The Yamaha YBR 125 passes its MOT first time more often than the Aprilia RS 125 11KW: 71.0% vs 58.1%, a 12.9-point lead. Adjusted for age, mileage and test class, the Yamaha YBR 125 still comes out ahead: -11.1 points vs comparable bikes for the Aprilia RS 125 11KW, -1.1 for the Yamaha YBR 125. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Aprilia RS 125 11KW fail its MOT on most?

Lights & signalling: 17.1% of Aprilia RS 125 11KW MOT tests failed on it, then steering & suspension (15.9%).

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%).

Which holds up better at high mileage, the Aprilia RS 125 11KW or the Yamaha YBR 125?

At 30k-40k miles the Yamaha YBR 125 passes first time more often: 46.9% for the Aprilia RS 125 11KW vs 62.2% for the Yamaha YBR 125.

APRILIA RS 125 11KW 58.1% pass · 731 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.