AJS JS 125-E2

124cc Petrol Class 1

#4794 of 5426 overall #29 of 45 AJSs #409 of 734 commuter bikes

69.1%

first-time pass rate

20.4%

failed outright

10,207

median miles at test

1,187

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2013–2025

The JS 125-E2's first-time pass rate has fallen 1.3 points since 2013, 74.6% to 73.3%.

Pass rate by mileage

how the JS 125-E2's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage JS 125-E2 passes first time 77.8% of the time; by 30k that's 54.2%.

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 JS 125-E2

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
brakes	131	19	1.9×
lighting and signalling	130	18.8	1.7×
lamps and reflectors	104	15.1	3.2×
structure and attachments	68	9.8	4.9×
drive system	65	9.4	5.0×
steering and suspension	63	9.1	1.3×
tyres and wheels	52	7.5	1.7×
suspension	36	5.2	3.5×
tyres	22	3.2	2.5×
body and structure	20	2.9	3.0×

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-E2 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-E2.

Pass rate by registration year

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

Best year to buy used: 2009 (80.0% pass). Weakest: 2010 (68.0%).

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-E2 FAQ

answers computed from the data above · terms in the glossary

Is the AJS JS 125-E2 reliable?

The AJS JS 125-E2 is less reliable than average for its class: 69.1% of its 1,187 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4794 of 5426 models.

What does a JS 125-E2 fail its MOT on most?

brakes — 19% of all defects recorded against failed JS 125-E2 tests.

What is the best year of JS 125-E2 to buy used?

By first-time pass rate, 2009-registered examples do best (80.0%) and 2010 worst (68.0%). Condition and history still trump the year.

How many miles will a JS 125-E2 last?

The median JS 125-E2 shows 10,207 miles at test, and examples around 30k miles still pass 54.2% of the time — mileage alone rarely kills one.