SYM JET 4 125 E4

125cc Petrol Class 1

#4579 of 5426 overall #61 of 78 SYMs #307 of 412 scooter bikes

72.0%

first-time pass rate

19.5%

failed outright

9,305

median miles at test

1,207

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2020–2025

The JET 4 125 E4's first-time pass rate has fallen 4.6 points since 2020, 79.1% to 74.5%.

Pass rate by mileage

how the JET 4 125 E4's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage JET 4 125 E4 passes first time 76.0% of the time; by 30k that's 56.3%.

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 JET 4 125 E4

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
brakes	222	39.9	2.6×
lamps and reflectors	161	28.9	6.1×
tyres	65	11.7	7.0×
suspension	38	6.8	3.6×
structure and attachments	35	6.3	3.6×
steering	23	4.1	4.2×
audible warning (Horn)	8	1.4	3.6×
wheels	3	0.5	4.1×
Identification of the vehicle	2	0.4	0.7×

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 JET 4 125 E4 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 JET 4 125 E4.

Pass rate by registration year

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

Best year to buy used: 2021 (73.3% pass). Weakest: 2019 (70.8%).

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.

SYM JET 4 125 E4 FAQ

answers computed from the data above · terms in the glossary

Is the SYM JET 4 125 E4 reliable?

The SYM JET 4 125 E4 is about average for its class: 72.0% of its 1,207 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4579 of 5426 models.

What does a JET 4 125 E4 fail its MOT on most?

brakes — 40% of all defects recorded against failed JET 4 125 E4 tests.

What is the best year of JET 4 125 E4 to buy used?

By first-time pass rate, 2021-registered examples do best (73.3%) and 2019 worst (70.8%). Condition and history still trump the year.

How many miles will a JET 4 125 E4 last?

The median JET 4 125 E4 shows 9,305 miles at test, and examples around 30k miles still pass 56.3% of the time — mileage alone rarely kills one.