Data as of: DVSA MOT results to 2025
Bsa B31: MOT pass rate by registration year
Which B31 years pass first time, and which fall short of the model's 92.0% average, from 3,429 DVSA tests.
Pass rate by registration year
Highest pass rate: 1951 (98.4% of 61 tests). Lowest: 1952 (87.8% of 123). Years more than two points below the model average: 1948, 1952, 1953, 1957.
| Registered | Tests | First-time pass | vs model (92.0%) |
|---|---|---|---|
| 1946 | 86 | 94.2% | +2.2 pp |
| 1947 | 61 | 93.4% | +1.4 pp |
| 1948 | 78 | 88.5% | -3.5 pp |
| 1949 | 236 | 90.7% | -1.3 pp |
| 1950 | 232 | 93.5% | +1.5 pp |
| 1951 | 61 | 98.4% | +6.4 pp |
| 1952 | 123 | 87.8% | -4.2 pp |
| 1953 | 299 | 88.6% | -3.4 pp |
| 1954 | 407 | 93.4% | +1.4 pp |
| 1955 | 442 | 93.0% | +1.0 pp |
| 1956 | 469 | 92.8% | +0.8 pp |
| 1957 | 206 | 89.8% | -2.2 pp |
| 1958 | 204 | 90.2% | -1.8 pp |
| 1959 | 234 | 91.0% | -1.0 pp |
| 1971 | 117 | 94.9% | +2.9 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
Questions
- Which B31 years have the lowest MOT pass rate?
- 1948, 1952, 1953, 1957 registered examples pass first time less often than the Bsa B31 overall (92.0%); the 1952 cohort is lowest at 87.8% from 123 tests.
- Which B31 year has the highest MOT pass rate?
- 1951, at 98.4% of 61 first tests (2005–2025). Years more than two points above the model average: 1946, 1951, 1971.
- How much does the B31 pass rate vary by year?
- 10.6 percentage points between the highest (1951, 98.4%) and lowest (1952, 87.8%) 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 B31 reliability, failures and mileage · ranked #470 of 5428 models· other Bsa models: A10, Bantam, C15, A65, B40, A7