SYM AD12W JET 4 125

124cc Petrol Class 1

#4506 of 5426 overall #50 of 78 SYMs #297 of 412 scooter bikes

72.9%

first-time pass rate

19.8%

failed outright

12,309

median miles at test

2,366

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2014–2025

The AD12W JET 4 125's first-time pass rate has risen 2.5 points since 2014, 77.9% to 80.4%.

Pass rate by mileage

how the AD12W JET 4 125's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage AD12W JET 4 125 passes first time 80.1% of the time; by 30k that's 60.2%.

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 AD12W JET 4 125

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
brakes	290	26	1.9×
lighting and signalling	169	15.2	1.1×
tyres and wheels	149	13.4	2.8×
steering and suspension	137	12.3	1.4×
lamps and reflectors	130	11.7	2.1×
tyres	66	5.9	3.6×
suspension	59	5.3	2.7×
structure and attachments	45	4	2.4×
steering	35	3.1	2.7×
fuel and exhaust	34	3.1	1.6×

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 AD12W JET 4 125 beats 0 of its 4 closest rivals (PIAGGIO VESPA, HONDA PCX 125, HONDA Vision 110).

PIAGGIO VESPA 80.7% pass · 287k tests HONDA PCX 125 81.1% pass · 88.6k tests HONDA Vision 110 78.2% pass · 50.6k tests YAMAHA NMAX 125 82.2% pass · 33.8k 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 AD12W JET 4 125.

Pass rate by registration year

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

Best year to buy used: 2013 (73.6% pass). Weakest: 2011 (71.3%).

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.

SYM AD12W JET 4 125 FAQ

answers computed from the data above · terms in the glossary

Is the SYM AD12W JET 4 125 reliable?

The SYM AD12W JET 4 125 is about average for its class: 72.9% of its 2,366 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4506 of 5426 models.

What does a AD12W JET 4 125 fail its MOT on most?

brakes — 26% of all defects recorded against failed AD12W JET 4 125 tests.

What is the best year of AD12W JET 4 125 to buy used?

By first-time pass rate, 2013-registered examples do best (73.6%) and 2011 worst (71.3%). Condition and history still trump the year.

How many miles will a AD12W JET 4 125 last?

The median AD12W JET 4 125 shows 12,309 miles at test, and examples around 30k miles still pass 60.2% of the time — mileage alone rarely kills one.