AJS JSM 125

124cc Petrol Class 1

54.9%

first-time pass rate

35.4%

failed outright

9,376

median miles at test

164

MOT tests, 2005–2025

What fails on a JSM 125

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lighting and signalling	74	29.4
brakes	69	27.4
steering and suspension	52	20.6
lamps and reflectors	16	6.3
drive system	16	6.3
fuel and exhaust	8	3.2
tyres and wheels	7	2.8
body and structure	5	2
structure and attachments	3	1.2
driving controls	2	0.8

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the JSM 125 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 JSM 125.

Pass rate by registration year

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

Best year to buy used: 2010 (56.9% pass). Weakest: 2010 (56.9%).

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.