1978 Yamaha Xs400 MOT Pass Rate
Pass rate for Xs400 models manufactured in 1978, based on 74 real MOT test results.
Data from official DVSA MOT testing records
1978 Yamaha Xs400 MOT Analysis
The 1978 Yamaha Xs400 has an MOT pass rate of 83.8% based on 74 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 21,393 miles on the odometer. With a 16.2% failure rate, the 1978 Xs400 is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1978 Yamaha Xs400 is Motorcycle structure and attachments, responsible for 1.4% of failures. Motorcycle structure and attachments issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs range from £100–400.
Top failures specific to 1978 models only. The overall Xs400 page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Motorcycle Structure And Attachments | 1.4% | 1 |
Failures per 10,000 Miles
avg. 21,393 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Motorcycle structure and attachments | 0.63 | 1.4% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1978 Yamaha Xs400 has an MOT pass rate of 83.8% based on 74 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 21,393 miles on the odometer. With a 16.2% failure rate, the 1978 Xs400 is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1978 Yamaha Xs400, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to motorcycle structure and attachments: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights. With relatively low average mileage of 21,393 miles, many of these vehicles are still in good mechanical condition.
Motorcycle structure and attachments — 1.4% of failures
Motorcycle structure and attachments issues account for 1.4% of MOT failures on 1978 Yamaha Xs400 models. Motorcycle structure and attachments issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.