Data as of: DVSA MOT results to 2025
Yamaha XS400: MOT pass rate by registration year
Which XS400 years pass first time, and which fall short of the model's 78.9% average, from 1,211 DVSA tests.
Pass rate by registration year
Highest pass rate: 1978 (82.9% of 105 tests). Lowest: 1982 (76.1% of 243). Years more than two points below the model average: 1982.
| Registered | Tests | First-time pass | vs model (78.9%) |
|---|---|---|---|
| 1978 | 105 | 82.9% | +4.0 pp |
| 1979 | 76 | 81.6% | +2.7 pp |
| 1980 | 326 | 79.1% | +0.2 pp |
| 1981 | 227 | 78.9% | +0.0 pp |
| 1982 | 243 | 76.1% | -2.8 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 XS400 years have the lowest MOT pass rate?
- 1982 registered examples pass first time less often than the Yamaha XS400 overall (78.9%); the 1982 cohort is lowest at 76.1% from 243 tests.
- Which XS400 year has the highest MOT pass rate?
- 1978, at 82.9% of 105 first tests (2005–2025). Years more than two points above the model average: 1978, 1979.
- How much does the XS400 pass rate vary by year?
- 6.8 percentage points between the highest (1978, 82.9%) and lowest (1982, 76.1%) 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: Yamaha XS400 reliability, failures and mileage · ranked #3788 of 5428 models· other Yamaha models: YZF-R1, YZF-R6, FZS600, YBR 125, XJR1300, FZ6