Bsa B25: MOT pass rate by registration year

Which B25 years pass first time, and which fall short of the model's 88.5% average, from 886 DVSA tests.

1970

highest-passing year · 89.6%

1968

lowest-passing year · 87.9%

1.7pp

spread across 4 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: 1970 (89.6% of 182 tests). Lowest: 1968 (87.9% of 198).

Registered	Tests	First-time pass	vs model (88.5%)
1968	198	87.9%	-0.6 pp
1969	200	88.5%	+0.0 pp
1970	182	89.6%	+1.1 pp
1971	232	89.2%	+0.7 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 · 2006–2017

Questions

Which B25 years have the lowest MOT pass rate?: none: no registration year of the Bsa B25 falls more than two points under the model's 88.5% overall pass rate.
Which B25 year has the highest MOT pass rate?: 1970, at 89.6% of 182 first tests (2005–2025).
How much does the B25 pass rate vary by year?: 1.7 percentage points between the highest (1970, 89.6%) and lowest (1968, 87.9%) 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: Bsa B25 reliability, failures and mileage · ranked #1449 of 5428 models· other Bsa models: A10, Bantam, C15, A65, B31, B40