Yamaha Yp400 MOT Pass Rate
Overall pass rate across all manufacture years, based on 3,959 real MOT test results. Failure rate: 14.6%.
Data from official DVSA MOT testing records
Yamaha Yp400 MOT Reliability Overview
The Yamaha Yp400 is a niche vehicle in the UK, with 3,959 MOT test results recorded in our database spanning 11 manufacture years. It has an overall MOT pass rate of 85.4% and a failure rate of 14.6%, which is well above the UK average of approximately 37%.
Based on this data, the Yamaha Yp400 earns a "Excellent" reliability rating. The average Yamaha Yp400 presents for MOT with approximately 18,994 miles on the clock. Manufacture year matters: 2014 models achieve the highest pass rate at 96.2%, while 2008 models have the lowest at 81.4%. This 14.8 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Yamaha Yp400 is Motorcycle brakes, affecting 14.5% 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 tyres and wheels at 4.6%. Motorcycle steering and suspension 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
📉 How Age Affects Reliability
MOT failure rate by vehicle age for the Yamaha Yp400. The dashed red line marks when the manufacturer warranty typically expires (3 years).
Line chart showing MOT failure rate by vehicle age from 3 to 11 years, with warranty expiry marked at 3 years.
💡 What does the warranty cliff mean?
The Yamaha Yp400 actually sees a 14% decrease in failure rate after the warranty period. This is likely due to survivorship bias — unreliable cars are already off the road by this age. Peak failure occurs at age 11 (21.5% fail rate).
Note: pass rates may improve for very old vehicles due to survivorship bias — only well-maintained cars remain on the road.
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 | 16.0% | 632 |
| 2 | Motorcycle Tyres And Wheels | 5.0% | 196 |
| 3 | Motorcycle Steering And Suspension | 3.7% | 148 |
| 4 | Motorcycle Lighting And Signalling | 2.8% | 111 |
| 5 | Motorcycle Tyres | 2.2% | 89 |
| 6 | Motorcycle Lamps And Reflectors | 1.7% | 68 |
| 7 | Motorcycle Suspension | 1.5% | 60 |
| 8 | Motorcycle Structure And Attachments | 0.7% | 28 |
| 9 | Motorcycle Steering | 0.7% | 27 |
| 10 | Motorcycle Fuel And Exhaust | 0.7% | 26 |
| 11 | Motorcycle Audible Warning (Horn) | 0.3% | 10 |
| 12 | Identification Of The Vehicle | 0.2% | 7 |
| 13 | Motorcycle Body And Structure | 0.2% | 6 |
| 14 | Non-component Advisories | 0.2% | 6 |
| 15 | Motorcycle Reg Plates And Vin | 0.1% | 5 |
Failures per 10,000 Miles
avg. 18,994 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 | 8.40 | 16.0% | 632 |
| Motorcycle tyres and wheels | 2.61 | 5.0% | 196 |
| Motorcycle steering and suspension | 1.97 | 3.7% | 148 |
| Motorcycle lighting and signalling | 1.48 | 2.8% | 111 |
| Motorcycle tyres | 1.18 | 2.2% | 89 |
| Motorcycle lamps and reflectors | 0.90 | 1.7% | 68 |
| Motorcycle suspension | 0.80 | 1.5% | 60 |
| Motorcycle structure and attachments | 0.37 | 0.7% | 28 |
| Motorcycle steering | 0.36 | 0.7% | 27 |
| Motorcycle fuel and exhaust | 0.35 | 0.7% | 26 |
| Motorcycle audible warning (Horn) | 0.13 | 0.3% | 10 |
| Identification of the vehicle | 0.09 | 0.2% | 7 |
| Motorcycle body and structure | 0.08 | 0.2% | 6 |
| Non-component advisories | 0.08 | 0.2% | 6 |
| Motorcycle reg plates and vin | 0.07 | 0.1% | 5 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Yamaha Yp400 has 18,994 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 Yp400 has a mileage-adjusted failure rate of 7.69% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Yamaha Yp400 MOT Data
The Yamaha Yp400 is a niche vehicle in the UK, with 3,959 MOT test results recorded in our database spanning 11 manufacture years. It has an overall MOT pass rate of 85.4% and a failure rate of 14.6%, which is well above the UK average of approximately 37%.
For Yamaha Yp400 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 tyres and wheels 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 Yp400 is likely to perform.
Motorcycle brakes — 14.5% of failures
Motorcycle brakes issues account for 14.5% of MOT failures on the Yamaha Yp400. 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 tyres and wheels — 4.6% of failures
Motorcycle tyres and wheels issues account for 4.6% of MOT failures on the Yamaha Yp400. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs: £50–200 per tyre. Pre-MOT check: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating.
Motorcycle steering and suspension — 3.6% of failures
Motorcycle steering and suspension issues account for 3.6% of MOT failures on the Yamaha Yp400. 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 Yp400?
Based on 3,959 MOT tests in our database, the Yamaha Yp400 has an overall pass rate of 85.4% (14.6% fail rate).
What are the most common MOT failures on a Yamaha Yp400?
The top 3 reasons a Yamaha Yp400 fails its MOT are: 1. Motorcycle brakes (14.5%), 2. Motorcycle tyres and wheels (4.6%), 3. Motorcycle steering and suspension (3.6%). Check these areas before booking your MOT.
Is the Yamaha Yp400 reliable?
With a 14.6% MOT failure rate, the Yp400 is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Yamaha Yp400?
Based on failure data, focus on: Motorcycle brakes (14.5%); Motorcycle tyres and wheels (4.6%); Motorcycle steering and suspension (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.