SINNIS JS

124cc Petrol Class 1

#4929 of 5426 overall #10 of 16 SINNISs #481 of 734 commuter bikes

66.6%

first-time pass rate

23.1%

failed outright

8,078

median miles at test

1,276

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2017–2025

The JS's first-time pass rate has fallen 8.1 points since 2017, 76.9% to 68.8%.

Pass rate by mileage

how the JS's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage JS passes first time 71.0% of the time; by 20k that's 59.6%.

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a JS

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lamps and reflectors	266	28.9	8.0×
structure and attachments	170	18.4	12.4×
brakes	170	18.4	2.2×
steering	102	11.1	15.8×
suspension	82	8.9	6.5×
tyres	64	6.9	6.9×
audible warning (Horn)	25	2.7	10.7×
lighting and signalling	22	2.4	0.3×
steering and suspension	11	1.2	0.2×
drive system	10	1.1	0.9×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the JS beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests GILERA RUNNER 70.8% pass · 69.9k tests

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the JS.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2015 (68.3% pass). Weakest: 2016 (62.8%).

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.

SINNIS JS FAQ

answers computed from the data above · terms in the glossary

Is the SINNIS JS reliable?

The SINNIS JS is less reliable than average for its class: 66.6% of its 1,276 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4929 of 5426 models.

What does a JS fail its MOT on most?

lamps and reflectors — 29% of all defects recorded against failed JS tests.

What is the best year of JS to buy used?

By first-time pass rate, 2015-registered examples do best (68.3%) and 2016 worst (62.8%). Condition and history still trump the year.

How many miles will a JS last?

The median JS shows 8,078 miles at test, and examples around 20k miles still pass 59.6% of the time — mileage alone rarely kills one.