Data as of: DVSA MOT results to 2025
Yamaha RD400: MOT pass rate by registration year
Which RD400 years pass first time, and which fall short of the model's 88.6% average, from 3,477 DVSA tests.
Pass rate by registration year
Highest pass rate: 1975 (94.2% of 52 tests). Lowest: 1977 (87.3% of 575).
| Registered | Tests | First-time pass | vs model (88.6%) |
|---|---|---|---|
| 1975 | 52 | 94.2% | +5.6 pp |
| 1976 | 627 | 89.6% | +1.0 pp |
| 1977 | 575 | 87.3% | -1.3 pp |
| 1978 | 718 | 89.7% | +1.1 pp |
| 1979 | 739 | 88.9% | +0.3 pp |
| 1980 | 507 | 87.6% | -1.0 pp |
| 1981 | 181 | 87.3% | -1.3 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 RD400 years have the lowest MOT pass rate?
- none: no registration year of the Yamaha RD400 falls more than two points under the model's 88.6% overall pass rate.
- Which RD400 year has the highest MOT pass rate?
- 1975, at 94.2% of 52 first tests (2005–2025).
- How much does the RD400 pass rate vary by year?
- 6.9 percentage points between the highest (1975, 94.2%) and lowest (1977, 87.3%) 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 RD400 reliability, failures and mileage · ranked #1402 of 5428 models· other Yamaha models: YZF-R1, YZF-R6, FZS600, YBR 125, XJR1300, FZ6