Data as of: DVSA MOT results to 2025
Norton 99: MOT pass rate by registration year
Which 99 years pass first time, and which fall short of the model's 93.6% average, from 767 DVSA tests.
Pass rate by registration year
Highest pass rate: 1961 (97.2% of 71 tests). Lowest: 1957 (88.9% of 63). Years more than two points below the model average: 1957, 1962.
| Registered | Tests | First-time pass | vs model (93.6%) |
|---|---|---|---|
| 1957 | 63 | 88.9% | -4.7 pp |
| 1958 | 102 | 92.2% | -1.4 pp |
| 1959 | 172 | 91.9% | -1.7 pp |
| 1960 | 177 | 96.0% | +2.4 pp |
| 1961 | 71 | 97.2% | +3.6 pp |
| 1962 | 55 | 90.9% | -2.7 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
Questions
- Which 99 years have the lowest MOT pass rate?
- 1957, 1962 registered examples pass first time less often than the Norton 99 overall (93.6%); the 1957 cohort is lowest at 88.9% from 63 tests.
- Which 99 year has the highest MOT pass rate?
- 1961, at 97.2% of 71 first tests (2005–2025). Years more than two points above the model average: 1960, 1961.
- How much does the 99 pass rate vary by year?
- 8.3 percentage points between the highest (1961, 97.2%) and lowest (1957, 88.9%) 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: Norton 99 reliability, failures and mileage · ranked #224 of 5428 models· other Norton models: Commando, Dominator, ES2, Commander, Triton, Atlas