Yamaha Rd400c MOT Pass Rate
Overall pass rate across all manufacture years, based on 134 real MOT test results. Failure rate: 16.4%.
Data from official DVSA MOT testing records
Yamaha Rd400c MOT Reliability Overview
The Yamaha Rd400c is a rare vehicle in the UK, with 134 MOT test results recorded in our database spanning 2 manufacture years. It has an overall MOT pass rate of 83.6% and a failure rate of 16.4%, which is well above the UK average of approximately 37%.
Based on this data, the Yamaha Rd400c earns a "Excellent" reliability rating. The average Yamaha Rd400c presents for MOT with approximately 17,602 miles on the clock. Manufacture year matters: 1976 models achieve the highest pass rate at 87.0%, while 1977 models have the lowest at 71.8%. This 15.2 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Yamaha Rd400c is Motorcycle brakes, affecting 6.0% of all tests. 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. The second most common issue is Motorcycle lighting and signalling at 5.2%. Motorcycle steering and suspension rounds out the top three at 3.7%. 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
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 Brakes | 8.2% | 11 |
| 2 | Motorcycle Lighting And Signalling | 5.2% | 7 |
| 3 | Motorcycle Steering And Suspension | 3.7% | 5 |
| 4 | Motorcycle Drive System | 3.0% | 4 |
| 5 | Motorcycle Fuel And Exhaust | 0.7% | 1 |
| 6 | Motorcycle Steering | 0.7% | 1 |
| 7 | Motorcycle Structure And Attachments | 0.7% | 1 |
| 8 | Motorcycle Audible Warning (Horn) | 0.7% | 1 |
| 9 | Motorcycle Tyres And Wheels | 0.7% | 1 |
| 10 | Motorcycle Lamps And Reflectors | 0.7% | 1 |
Failures per 10,000 Miles
avg. 17,602 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 brakes | 4.66 | 8.2% | 11 |
| Motorcycle lighting and signalling | 2.97 | 5.2% | 7 |
| Motorcycle steering and suspension | 2.12 | 3.7% | 5 |
| Motorcycle drive system | 1.70 | 3.0% | 4 |
| Motorcycle fuel and exhaust | 0.42 | 0.7% | 1 |
| Motorcycle steering | 0.42 | 0.7% | 1 |
| Motorcycle structure and attachments | 0.42 | 0.7% | 1 |
| Motorcycle audible warning (Horn) | 0.42 | 0.7% | 1 |
| Motorcycle tyres and wheels | 0.42 | 0.7% | 1 |
| Motorcycle lamps and reflectors | 0.42 | 0.7% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Yamaha Rd400c has 17,602 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 Rd400c has a mileage-adjusted failure rate of 9.32% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Yamaha Rd400c MOT Data
The Yamaha Rd400c is a rare vehicle in the UK, with 134 MOT test results recorded in our database spanning 2 manufacture years. It has an overall MOT pass rate of 83.6% and a failure rate of 16.4%, which is well above the UK average of approximately 37%.
For Yamaha Rd400c owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on motorcycle brakes and motorcycle lighting and signalling 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 Rd400c is likely to perform.
Motorcycle brakes — 6.0% of failures
Motorcycle brakes issues account for 6.0% of MOT failures on the Yamaha Rd400c. 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 lighting and signalling — 5.2% of failures
Motorcycle lighting and signalling issues account for 5.2% of MOT failures on the Yamaha Rd400c. 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 — 3.7% of failures
Motorcycle steering and suspension issues account for 3.7% of MOT failures on the Yamaha Rd400c. 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 Rd400c?
Based on 134 MOT tests in our database, the Yamaha Rd400c has an overall pass rate of 83.6% (16.4% fail rate).
What are the most common MOT failures on a Yamaha Rd400c?
The top 3 reasons a Yamaha Rd400c fails its MOT are: 1. Motorcycle brakes (6.0%), 2. Motorcycle lighting and signalling (5.2%), 3. Motorcycle steering and suspension (3.7%). Check these areas before booking your MOT.
Is the Yamaha Rd400c reliable?
With a 16.4% MOT failure rate, the Rd400c is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Yamaha Rd400c?
Based on failure data, focus on: Motorcycle brakes (6.0%); Motorcycle lighting and signalling (5.2%); Motorcycle steering and suspension (3.7%). 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.