Sanya SY 125-11 vs Yamaha YBR 125

The Yamaha YBR 125 passes its MOT first time more often than the Sanya SY 125-11: 71.0% vs 56.3%, a 14.7-point lead.

MOT reliability, side by side

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

Metric	Sanya SY 125-11	Yamaha YBR 125
First-time pass rate	56.3%	71.0%
Outright fail rate	27.8%	17.1%
Vs comparable bikes (age & mileage adjusted)	-17.7 pts	-1.1 pts
Engine size	125cc	124cc
Rank among all models	#5315 of 5428	#4664 of 5428
Median miles at test	6,909	10,652
MOT tests analysed	835	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	Sanya SY 125-11	Yamaha YBR 125
Lights & signalling	18.4%	8.5%
Steering & suspension	12.9%	6.5%
Brakes	10.8%	5.9%
Drive system	7.9%	2.9%
Structure & body	6.8%	3.8%
Tyres & wheels	2.8%	4.4%
Fuel & exhaust	2.4%	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	Sanya SY 125-11	Yamaha YBR 125
2011	54.2%	69.1%
2012	54.4%	69.1%
2013	58.4%	69.5%
2014	49.6%	70.0%
2015	50.5%	71.2%
2016	55.6%	71.3%
2017	58.7%	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	Sanya SY 125-11	Yamaha YBR 125
0k-10k miles	59.5%	76.8%
10k-20k miles	48.1%	67.4%
20k-30k miles	47.5%	63.8%

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

Sanya SY 125-11 vs Yamaha YBR 125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Sanya SY 125-11 or the Yamaha YBR 125?

The Yamaha YBR 125 passes its MOT first time more often than the Sanya SY 125-11: 71.0% vs 56.3%, a 14.7-point lead. Adjusted for age, mileage and test class, the Yamaha YBR 125 still comes out ahead: -17.7 points vs comparable bikes for the Sanya SY 125-11, -1.1 for the Yamaha YBR 125. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Sanya SY 125-11 fail its MOT on most?

Lights & signalling: 18.4% of Sanya SY 125-11 MOT tests failed on it, then steering & suspension (12.9%).

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 Sanya SY 125-11 or the Yamaha YBR 125?

At 20k-30k miles the Yamaha YBR 125 passes first time more often: 47.5% for the Sanya SY 125-11 vs 63.8% for the Yamaha YBR 125.

SANYA SY 125-11 56.3% pass · 835 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.