AJS JS 125-E

124cc Petrol Class 1

#5097 of 5426 overall #36 of 45 AJSs #565 of 734 commuter bikes

63.2%

first-time pass rate

24.6%

failed outright

12,612

median miles at test

699

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2011–2017

The JS 125-E's first-time pass rate has risen 7.9 points since 2011, 55.6% to 63.5%.

Pass rate by mileage

how the JS 125-E's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage JS 125-E passes first time 71.4% of the time; by 30k that's 70.5%.

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 125-E

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	137	28.1	3.1×
drive system	82	16.8	11.1×
brakes	80	16.4	2.1×
steering and suspension	68	13.9	2.4×
tyres and wheels	45	9.2	3.0×
structure and attachments	25	5.1	3.6×
lamps and reflectors	22	4.5	1.3×
suspension	11	2.3	1.9×
driving controls	9	1.8	5.5×
body and structure	9	1.8	2.7×

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 JS 125-E 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 125-E.

Pass rate by registration year

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

Best year to buy used: 2008 (63.9% pass). Weakest: 2009 (63.7%).

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.

AJS JS 125-E FAQ

answers computed from the data above · terms in the glossary

Is the AJS JS 125-E reliable?

The AJS JS 125-E is less reliable than average for its class: 63.2% of its 699 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #5097 of 5426 models.

What does a JS 125-E fail its MOT on most?

lighting and signalling — 28% of all defects recorded against failed JS 125-E tests.

How many miles will a JS 125-E last?

The median JS 125-E shows 12,612 miles at test, and examples around 30k miles still pass 70.5% of the time — mileage alone rarely kills one.