Yamaha Rd400 MOT Pass Rate
Overall pass rate across all manufacture years, based on 2,389 real MOT test results. Failure rate: 11.2%.
Data from official DVSA MOT testing records
Yamaha Rd400 MOT Reliability Overview
The Yamaha Rd400 is a niche vehicle in the UK, with 2,389 MOT test results recorded in our database spanning 7 manufacture years. It has an overall MOT pass rate of 88.8% and a failure rate of 11.2%, which is well above the UK average of approximately 37%.
Based on this data, the Yamaha Rd400 earns a "Excellent" reliability rating. The average Yamaha Rd400 presents for MOT with approximately 20,393 miles on the clock. Manufacture year matters: 1975 models achieve the highest pass rate at 97.5%, while 1977 models have the lowest at 87.6%. This 9.9 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Yamaha Rd400 is Motorcycle lighting and signalling, affecting 7.7% 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 brakes at 4.5%. Motorcycle steering and suspension rounds out the top three at 3.1%. 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 | 8.5% | 204 |
| 2 | Motorcycle Brakes | 5.0% | 120 |
| 3 | Motorcycle Steering And Suspension | 3.6% | 87 |
| 4 | Motorcycle Tyres And Wheels | 1.9% | 45 |
| 5 | Motorcycle Drive System | 1.3% | 31 |
| 6 | Motorcycle Body And Structure | 0.9% | 21 |
| 7 | Motorcycle Lamps And Reflectors | 0.8% | 20 |
| 8 | Motorcycle Fuel And Exhaust | 0.6% | 15 |
| 9 | Motorcycle Reg Plates And Vin | 0.4% | 10 |
| 10 | Motorcycle Suspension | 0.4% | 9 |
| 11 | Motorcycle Driving Controls | 0.3% | 6 |
| 12 | Motorcycle Structure And Attachments | 0.2% | 5 |
| 13 | Items Not Tested | 0.1% | 3 |
| 14 | Motorcycle Wheels | 0.1% | 3 |
| 15 | Motorcycle Audible Warning (Horn) | 0.1% | 3 |
Failures per 10,000 Miles
avg. 20,393 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 lighting and signalling | 4.19 | 8.5% | 204 |
| Motorcycle brakes | 2.46 | 5.0% | 120 |
| Motorcycle steering and suspension | 1.79 | 3.6% | 87 |
| Motorcycle tyres and wheels | 0.92 | 1.9% | 45 |
| Motorcycle drive system | 0.64 | 1.3% | 31 |
| Motorcycle body and structure | 0.43 | 0.9% | 21 |
| Motorcycle lamps and reflectors | 0.41 | 0.8% | 20 |
| Motorcycle fuel and exhaust | 0.31 | 0.6% | 15 |
| Motorcycle reg plates and vin | 0.21 | 0.4% | 10 |
| Motorcycle suspension | 0.18 | 0.4% | 9 |
| Motorcycle driving controls | 0.12 | 0.3% | 6 |
| Motorcycle structure and attachments | 0.10 | 0.2% | 5 |
| Items Not Tested | 0.06 | 0.1% | 3 |
| Motorcycle wheels | 0.06 | 0.1% | 3 |
| Motorcycle audible warning (Horn) | 0.06 | 0.1% | 3 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Yamaha Rd400 has 20,393 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 Yamaha Rd400 has a mileage-adjusted failure rate of 5.49% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Yamaha Rd400 MOT Data
The Yamaha Rd400 is a niche vehicle in the UK, with 2,389 MOT test results recorded in our database spanning 7 manufacture years. It has an overall MOT pass rate of 88.8% and a failure rate of 11.2%, which is well above the UK average of approximately 37%.
For Yamaha Rd400 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 brakes 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 Rd400 is likely to perform.
Motorcycle lighting and signalling — 7.7% of failures
Motorcycle lighting and signalling issues account for 7.7% of MOT failures on the Yamaha Rd400. 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 brakes — 4.5% of failures
Motorcycle brakes issues account for 4.5% of MOT failures on the Yamaha Rd400. 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).
Motorcycle steering and suspension — 3.1% of failures
Motorcycle steering and suspension issues account for 3.1% of MOT failures on the Yamaha Rd400. 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.
Frequently Asked Questions
What is the MOT pass rate for the Yamaha Rd400?
Based on 2,389 MOT tests in our database, the Yamaha Rd400 has an overall pass rate of 88.8% (11.2% fail rate).
What are the most common MOT failures on a Yamaha Rd400?
The top 3 reasons a Yamaha Rd400 fails its MOT are: 1. Motorcycle lighting and signalling (7.7%), 2. Motorcycle brakes (4.5%), 3. Motorcycle steering and suspension (3.1%). Check these areas before booking your MOT.
Is the Yamaha Rd400 reliable?
With a 11.2% MOT failure rate, the Rd400 is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Yamaha Rd400?
Based on failure data, focus on: Motorcycle lighting and signalling (7.7%); Motorcycle brakes (4.5%); Motorcycle steering and suspension (3.1%). 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.