Honda Cb400/4 MOT Pass Rate
Overall pass rate across all manufacture years, based on 913 real MOT test results. Failure rate: 13.4%.
Data from official DVSA MOT testing records
Honda Cb400/4 MOT Reliability Overview
The Honda Cb400/4 is a rare vehicle in the UK, with 913 MOT test results recorded in our database spanning 5 manufacture years. It has an overall MOT pass rate of 86.6% and a failure rate of 13.4%, which is well above the UK average of approximately 37%.
Based on this data, the Honda Cb400/4 earns a "Excellent" reliability rating. The average Honda Cb400/4 presents for MOT with approximately 31,264 miles on the clock. Manufacture year matters: 1979 models achieve the highest pass rate at 90.9%, while 1978 models have the lowest at 84.6%. This 6.3 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Honda Cb400/4 is Motorcycle lighting and signalling, affecting 7.8% of all tests. Motorcycle lighting and signalling issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. The second most common issue is Motorcycle steering and suspension at 6.1%. Motorcycle brakes rounds out the top three at 3.6%. Together, these top 3 failure categories account for a significant portion of all MOT failures for this model.
Top failures across all manufacture years combined. Individual year pages may show different top failures.
What Fails Most
Best Year to Buy
📈 How Each Vintage Ages
Pass Rate by Manufacture Year
* High Fail Rate badge indicates an MOT pass rate below 65% (failure rate above 35%).
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Motorcycle Lighting And Signalling | 8.3% | 76 |
| 2 | Motorcycle Steering And Suspension | 6.8% | 62 |
| 3 | Motorcycle Brakes | 3.9% | 36 |
| 4 | Motorcycle Drive System | 3.0% | 27 |
| 5 | Motorcycle Tyres And Wheels | 2.3% | 21 |
| 6 | Motorcycle Fuel And Exhaust | 1.5% | 14 |
| 7 | Motorcycle Lamps And Reflectors | 1.0% | 9 |
| 8 | Motorcycle Body And Structure | 0.7% | 6 |
| 9 | Motorcycle Driving Controls | 0.4% | 4 |
| 10 | Motorcycle Suspension | 0.3% | 3 |
| 11 | Motorcycle Reg Plates And Vin | 0.3% | 3 |
| 12 | Motorcycle Tyres | 0.3% | 3 |
| 13 | Motorcycle Structure And Attachments | 0.2% | 2 |
| 14 | Non-component Advisories | 0.1% | 1 |
Failures per 10,000 Miles
avg. 31,264 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 lighting and signalling | 2.66 | 8.3% | 76 |
| Motorcycle steering and suspension | 2.17 | 6.8% | 62 |
| Motorcycle brakes | 1.26 | 3.9% | 36 |
| Motorcycle drive system | 0.95 | 3.0% | 27 |
| Motorcycle tyres and wheels | 0.74 | 2.3% | 21 |
| Motorcycle fuel and exhaust | 0.49 | 1.5% | 14 |
| Motorcycle lamps and reflectors | 0.32 | 1.0% | 9 |
| Motorcycle body and structure | 0.21 | 0.7% | 6 |
| Motorcycle driving controls | 0.14 | 0.4% | 4 |
| Motorcycle suspension | 0.11 | 0.3% | 3 |
| Motorcycle reg plates and vin | 0.11 | 0.3% | 3 |
| Motorcycle tyres | 0.11 | 0.3% | 3 |
| Motorcycle structure and attachments | 0.07 | 0.2% | 2 |
| Non-component advisories | 0.04 | 0.1% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Honda Cb400/4 has 31,264 miles when tested for MOT.
📊 Mileage-Adjusted Failure Rate
How often this car fails MOT relative to how much it's driven — a fairer comparison than raw pass rate.
The Honda Cb400/4 has a mileage-adjusted failure rate of 4.29% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Honda Cb400/4 MOT Data
The Honda Cb400/4 is a rare vehicle in the UK, with 913 MOT test results recorded in our database spanning 5 manufacture years. It has an overall MOT pass rate of 86.6% and a failure rate of 13.4%, which is well above the UK average of approximately 37%.
For Honda Cb400/4 owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on motorcycle lighting and signalling and motorcycle steering and suspension for the best chance of a first-time pass. Use our detailed year-by-year breakdown and failure analysis below to understand how your specific Cb400/4 is likely to perform.
Motorcycle lighting and signalling — 7.8% of failures
Motorcycle lighting and signalling issues account for 7.8% of MOT failures on the Honda Cb400/4. Motorcycle lighting and signalling 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 steering and suspension — 6.1% of failures
Motorcycle steering and suspension issues account for 6.1% of MOT failures on the Honda Cb400/4. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Motorcycle brakes — 3.6% of failures
Motorcycle brakes issues account for 3.6% of MOT failures on the Honda Cb400/4. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Frequently Asked Questions
What is the MOT pass rate for the Honda Cb400/4?
Based on 913 MOT tests in our database, the Honda Cb400/4 has an overall pass rate of 86.6% (13.4% fail rate).
What are the most common MOT failures on a Honda Cb400/4?
The top 3 reasons a Honda Cb400/4 fails its MOT are: 1. Motorcycle lighting and signalling (7.8%), 2. Motorcycle steering and suspension (6.1%), 3. Motorcycle brakes (3.6%). Check these areas before booking your MOT.
Is the Honda Cb400/4 reliable?
With a 13.4% MOT failure rate, the Cb400/4 is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Honda Cb400/4?
Based on failure data, focus on: Motorcycle lighting and signalling (7.8%); Motorcycle steering and suspension (6.1%); Motorcycle brakes (3.6%). These are the areas most likely to cause a fail. Also check all lights, tyres (minimum 1.6mm tread), and windscreen condition — these are quick wins that apply to all cars.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.