Ajs JSM: MOT pass rate by registration year

Which JSM years pass first time, and which fall short of the model's 56.4% average, from 599 DVSA tests.

2017

highest-passing year · 69.1%

2018

lowest-passing year · 51.4%

17.7pp

spread across 5 years

Pass rate by registration year

first-time pass rate · cohorts with 50 or more tests · registration year from first use date

Highest pass rate: 2017 (69.1% of 55 tests). Lowest: 2018 (51.4% of 109). Years more than two points below the model average: 2016, 2018.

Registered	Tests	First-time pass	vs model (56.4%)
2014	109	55.0%	-1.4 pp
2015	124	58.1%	+1.7 pp
2016	111	52.3%	-4.1 pp
2017	55	69.1%	+12.7 pp
2018	109	51.4%	-5.0 pp

Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years. A first-time MOT pass is a roadworthiness check, not a full mechanical inspection.

Pass rate over time

first-time pass rate by test year · 2017–2025

Questions

Which JSM years have the lowest MOT pass rate?: 2016, 2018 registered examples pass first time less often than the Ajs JSM overall (56.4%); the 2018 cohort is lowest at 51.4% from 109 tests.
Which JSM year has the highest MOT pass rate?: 2017, at 69.1% of 55 first tests (2005–2025).
How much does the JSM pass rate vary by year?: 17.7 percentage points between the highest (2017, 69.1%) and lowest (2018, 51.4%) cohorts with at least 50 tests. Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.

Full report: Ajs JSM reliability, failures and mileage · ranked #5314 of 5428 models· other Ajs models: Modena, Modena 125, DD, Firefox, DD 125 E 08, 16MS