Yamaha Dt125 MOT Pass Rate
Overall pass rate across all manufacture years, based on 29,833 real MOT test results. Failure rate: 34.4%.
Data from official DVSA MOT testing records
Yamaha Dt125 MOT Reliability Overview
The Yamaha Dt125 is a relatively common sight on UK roads, with 29,833 MOT test results recorded in our database spanning 40 manufacture years. It has an overall MOT pass rate of 65.6% and a failure rate of 34.4%, which is slightly above the UK average of approximately 37%.
Based on this data, the Yamaha Dt125 earns a "Good" reliability rating. The average Yamaha Dt125 presents for MOT with approximately 17,344 miles on the clock. Manufacture year matters: 1978 models achieve the highest pass rate at 90.6%, while 1974 models have the lowest at 56.7%. This 33.9 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Yamaha Dt125 is Motorcycle lighting and signalling, affecting 28.1% 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 19.9%. Motorcycle steering and suspension rounds out the top three at 16.5%. 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
Tracking how each manufacture year's MOT pass rate changes as the car ages. Showing 9 vintages — click year chips to highlight.
Multi-line chart showing how different Yamaha Dt125 vintages degrade over time, from age 3 to 23 years.
Only vintages with 100+ tests in at least 3 different test years are shown. Fleet average is the UK-wide pass rate for all cars at each age.
📉 How Age Affects Reliability
MOT failure rate by vehicle age for the Yamaha Dt125. 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 20 years, with warranty expiry marked at 3 years.
💡 What does the warranty cliff mean?
The Yamaha Dt125 ages relatively gracefully. The failure rate increase of 16% after warranty is below average, suggesting good long-term reliability. Peak failure occurs at age 11 (39.4% 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 Lighting And Signalling | 36.4% | 10,852 |
| 2 | Motorcycle Brakes | 24.2% | 7,218 |
| 3 | Motorcycle Steering And Suspension | 20.4% | 6,073 |
| 4 | Motorcycle Tyres And Wheels | 16.9% | 5,047 |
| 5 | Motorcycle Drive System | 14.3% | 4,280 |
| 6 | Motorcycle Lamps And Reflectors | 7.6% | 2,273 |
| 7 | Motorcycle Fuel And Exhaust | 3.8% | 1,141 |
| 8 | Motorcycle Structure And Attachments | 3.7% | 1,097 |
| 9 | Motorcycle Reg Plates And Vin | 3.5% | 1,048 |
| 10 | Motorcycle Body And Structure | 3.5% | 1,042 |
| 11 | Motorcycle Suspension | 2.9% | 858 |
| 12 | Motorcycle Wheels | 1.6% | 484 |
| 13 | Motorcycle Driving Controls | 1.4% | 414 |
| 14 | Motorcycle Steering | 1.3% | 401 |
| 15 | Motorcycle Tyres | 1.2% | 355 |
Failures per 10,000 Miles
avg. 17,344 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 | 20.97 | 36.4% | 10,852 |
| Motorcycle brakes | 13.95 | 24.2% | 7,218 |
| Motorcycle steering and suspension | 11.74 | 20.4% | 6,073 |
| Motorcycle tyres and wheels | 9.75 | 16.9% | 5,047 |
| Motorcycle drive system | 8.27 | 14.3% | 4,280 |
| Motorcycle lamps and reflectors | 4.39 | 7.6% | 2,273 |
| Motorcycle fuel and exhaust | 2.21 | 3.8% | 1,141 |
| Motorcycle structure and attachments | 2.12 | 3.7% | 1,097 |
| Motorcycle reg plates and vin | 2.03 | 3.5% | 1,048 |
| Motorcycle body and structure | 2.01 | 3.5% | 1,042 |
| Motorcycle suspension | 1.66 | 2.9% | 858 |
| Motorcycle wheels | 0.94 | 1.6% | 484 |
| Motorcycle driving controls | 0.80 | 1.4% | 414 |
| Motorcycle steering | 0.77 | 1.3% | 401 |
| Motorcycle tyres | 0.69 | 1.2% | 355 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Yamaha Dt125 has 17,344 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 Dt125 has a mileage-adjusted failure rate of 19.83% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Yamaha Dt125 MOT Data
The Yamaha Dt125 is a relatively common sight on UK roads, with 29,833 MOT test results recorded in our database spanning 40 manufacture years. It has an overall MOT pass rate of 65.6% and a failure rate of 34.4%, which is slightly above the UK average of approximately 37%.
For Yamaha Dt125 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 Dt125 is likely to perform.
Motorcycle lighting and signalling — 28.1% of failures
Motorcycle lighting and signalling issues account for 28.1% of MOT failures on the Yamaha Dt125. 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 — 19.9% of failures
Motorcycle brakes issues account for 19.9% of MOT failures on the Yamaha Dt125. 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 — 16.5% of failures
Motorcycle steering and suspension issues account for 16.5% of MOT failures on the Yamaha Dt125. 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 Dt125?
Based on 29,833 MOT tests in our database, the Yamaha Dt125 has an overall pass rate of 65.6% (34.4% fail rate).
What are the most common MOT failures on a Yamaha Dt125?
The top 3 reasons a Yamaha Dt125 fails its MOT are: 1. Motorcycle lighting and signalling (28.1%), 2. Motorcycle brakes (19.9%), 3. Motorcycle steering and suspension (16.5%). Check these areas before booking your MOT.
Is the Yamaha Dt125 reliable?
With a 34.4% MOT failure rate, the Dt125 is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Yamaha Dt125?
Based on failure data, focus on: Motorcycle lighting and signalling (28.1%); Motorcycle brakes (19.9%); Motorcycle steering and suspension (16.5%). 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.