AJS ISABA

125cc Petrol Class 1

71.8%

first-time pass rate

18.8%

failed outright

2,005

median miles at test

MOT tests, 2005–2025

What fails on a ISABA

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lamps and reflectors	18	37.5
structure and attachments	8	16.7
steering	8	16.7
brakes	7	14.6
suspension	3	6.2
Identification of the vehicle	2	4.2
audible warning (Horn)	1	2.1
tyres	1	2.1

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 ISABA beats 2 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 ISABA.

Pass rate by registration year

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

Best year to buy used: 2020 (70.7% pass). Weakest: 2020 (70.7%).

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.