Sinnis JS vs Honda CG125

The Honda CG125 passes its MOT first time more often than the Sinnis JS: 72.2% vs 66.6%, a 5.6-point lead.

MOT reliability, side by side

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

Metric	Sinnis JS	Honda CG125
First-time pass rate	66.6%	72.2%
Outright fail rate	23.1%	16.8%
Vs comparable bikes (age & mileage adjusted)	-6.7 pts	+0.7 pts
Engine size	124cc	124cc
Rank among all models	#4931 of 5428	#4568 of 5428
Median miles at test	8,078	17,460
MOT tests analysed	1,276	89,345
Most common failure	lamps and reflectors	lighting and signalling

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	Sinnis JS	Honda CG125
Lights & signalling	13.7%	10.0%
Steering & suspension	10.0%	7.2%
Brakes	9.0%	5.1%
Structure & body	8.6%	1.9%
Tyres & wheels	5.3%	4.6%
Drive system	0.6%	2.6%
Fuel & exhaust	0.1%	0.9%

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	Sinnis JS	Honda CG125
2018	66.4%	72.6%
2019	64.3%	71.8%
2020	66.3%	73.6%
2021	67.0%	73.9%
2022	68.2%	73.5%
2023	63.3%	74.4%
2024	65.0%	73.0%
2025	68.8%	76.4%

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	Sinnis JS	Honda CG125
0k-10k miles	71.0%	79.3%
10k-20k miles	60.4%	73.0%
20k-30k miles	59.6%	68.3%

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

Sinnis JS vs Honda CG125 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Sinnis JS or the Honda CG125?

The Honda CG125 passes its MOT first time more often than the Sinnis JS: 72.2% vs 66.6%, a 5.6-point lead. Adjusted for age, mileage and test class, the Honda CG125 still comes out ahead: -6.7 points vs comparable bikes for the Sinnis JS, +0.7 for the Honda CG125. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Sinnis JS fail its MOT on most?

Lights & signalling: 13.7% of Sinnis JS MOT tests failed on it, then steering & suspension (10.0%).

What does the Honda CG125 fail its MOT on most?

Lights & signalling: 10.0% of Honda CG125 MOT tests failed on it, then steering & suspension (7.2%).

Which holds up better at high mileage, the Sinnis JS or the Honda CG125?

At 20k-30k miles the Honda CG125 passes first time more often: 59.6% for the Sinnis JS vs 68.3% for the Honda CG125.

SINNIS JS 66.6% pass · 1,276 tests HONDA CG125 72.2% pass · 89.3k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.