1978 Honda Cb400a MOT Pass Rate
Pass rate for Cb400a models manufactured in 1978, based on 43 real MOT test results.
Data from official DVSA MOT testing records
1978 Honda Cb400a MOT Analysis
The 1978 Honda Cb400a has an MOT pass rate of 69.8% based on 43 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 31,663 miles on the odometer. With a 30.2% failure rate, the 1978 Cb400a is rated as "Good" for MOT reliability.
The leading cause of MOT failure for the 1978 Honda Cb400a is Motorcycle structure and attachments, responsible for 11.6% 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. Motorcycle lamps and reflectors is the second most common issue at 7.0%. Motorcycle audible warning (Horn) follows at 2.3%.
Top failures specific to 1978 models only. The overall Cb400a 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 | 11.6% | 5 |
| 2 | Motorcycle Lamps And Reflectors | 7.0% | 3 |
| 3 | Motorcycle Audible Warning (Horn) | 2.3% | 1 |
| 4 | Motorcycle Brakes | 2.3% | 1 |
| 5 | Motorcycle Suspension | 2.3% | 1 |
Failures per 10,000 Miles
avg. 31,663 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.
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| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Motorcycle structure and attachments | 3.67 | 11.6% | 5 |
| Motorcycle lamps and reflectors | 2.20 | 7.0% | 3 |
| Motorcycle audible warning (Horn) | 0.73 | 2.3% | 1 |
| Motorcycle brakes | 0.73 | 2.3% | 1 |
| Motorcycle suspension | 0.73 | 2.3% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1978 Honda Cb400a has an MOT pass rate of 69.8% based on 43 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 31,663 miles on the odometer. With a 30.2% failure rate, the 1978 Cb400a is rated as "Good" for MOT reliability.
If you own or are considering buying a 1978 Honda Cb400a, 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 31,663 miles, many of these vehicles are still in good mechanical condition.
Motorcycle structure and attachments — 11.6% of failures
Motorcycle structure and attachments issues account for 11.6% of MOT failures on 1978 Honda Cb400a 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.
Motorcycle lamps and reflectors — 7.0% of failures
Motorcycle lamps and reflectors issues account for 7.0% of MOT failures on 1978 Honda Cb400a models. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Motorcycle audible warning (Horn) — 2.3% of failures
Motorcycle audible warning (Horn) issues account for 2.3% of MOT failures on 1978 Honda Cb400a models. Motorcycle audible warning (Horn) 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.