Harley Davidson Unclassified MOT Pass Rate
Overall pass rate across all manufacture years, based on 40,344 real MOT test results. Failure rate: 13.9%.
Data from official DVSA MOT testing records
Harley Davidson Unclassified MOT Reliability Overview
The Harley Davidson Unclassified is a relatively common sight on UK roads, with 40,344 MOT test results recorded in our database spanning 56 manufacture years. It has an overall MOT pass rate of 86.1% and a failure rate of 13.9%, which is well above the UK average of approximately 37%.
Based on this data, the Harley Davidson Unclassified earns a "Excellent" reliability rating. The average Harley Davidson Unclassified presents for MOT with approximately 19,258 miles on the clock. Manufacture year matters: 1964 models achieve the highest pass rate at 95.2%, while 1967 models have the lowest at 76.1%. This 19.1 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Harley Davidson Unclassified is Motorcycle lighting and signalling, affecting 7.4% 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 4.3%. Motorcycle lamps and reflectors rounds out the top three at 3.4%. 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 10 vintages — click year chips to highlight.
Multi-line chart showing how different Harley Davidson Unclassified vintages degrade over time, from age 3 to 35 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 Harley Davidson Unclassified. 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 Harley Davidson Unclassified ages relatively gracefully. The failure rate increase of 10% after warranty is below average, suggesting good long-term reliability. Peak failure occurs at age 16 (15.5% 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 Lighting And Signalling | 8.7% | 3,497 |
| 2 | Motorcycle Brakes | 4.7% | 1,898 |
| 3 | Motorcycle Lamps And Reflectors | 3.4% | 1,383 |
| 4 | Motorcycle Steering And Suspension | 2.7% | 1,098 |
| 5 | Motorcycle Fuel And Exhaust | 2.6% | 1,044 |
| 6 | Motorcycle Reg Plates And Vin | 2.4% | 959 |
| 7 | Motorcycle Tyres And Wheels | 2.0% | 789 |
| 8 | Motorcycle Structure And Attachments | 1.5% | 619 |
| 9 | Identification Of The Vehicle | 0.9% | 367 |
| 10 | Motorcycle Drive System | 0.7% | 286 |
| 11 | Motorcycle Tyres | 0.6% | 260 |
| 12 | Motorcycle Suspension | 0.6% | 259 |
| 13 | Motorcycle Steering | 0.4% | 157 |
| 14 | Motorcycle Body And Structure | 0.3% | 129 |
| 15 | Motorcycle Audible Warning (Horn) | 0.3% | 121 |
Failures per 10,000 Miles
avg. 19,258 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 | 4.50 | 8.7% | 3,497 |
| Motorcycle brakes | 2.44 | 4.7% | 1,898 |
| Motorcycle lamps and reflectors | 1.78 | 3.4% | 1,383 |
| Motorcycle steering and suspension | 1.41 | 2.7% | 1,098 |
| Motorcycle fuel and exhaust | 1.34 | 2.6% | 1,044 |
| Motorcycle reg plates and vin | 1.23 | 2.4% | 959 |
| Motorcycle tyres and wheels | 1.02 | 2.0% | 789 |
| Motorcycle structure and attachments | 0.80 | 1.5% | 619 |
| Identification of the vehicle | 0.47 | 0.9% | 367 |
| Motorcycle drive system | 0.37 | 0.7% | 286 |
| Motorcycle tyres | 0.33 | 0.6% | 260 |
| Motorcycle suspension | 0.33 | 0.6% | 259 |
| Motorcycle steering | 0.20 | 0.4% | 157 |
| Motorcycle body and structure | 0.17 | 0.3% | 129 |
| Motorcycle audible warning (Horn) | 0.16 | 0.3% | 121 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Harley Davidson Unclassified has 19,258 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 Harley Davidson Unclassified has a mileage-adjusted failure rate of 7.22% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Harley Davidson Unclassified MOT Data
The Harley Davidson Unclassified is a relatively common sight on UK roads, with 40,344 MOT test results recorded in our database spanning 56 manufacture years. It has an overall MOT pass rate of 86.1% and a failure rate of 13.9%, which is well above the UK average of approximately 37%.
For Harley Davidson Unclassified 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 Unclassified is likely to perform.
Motorcycle lighting and signalling — 7.4% of failures
Motorcycle lighting and signalling issues account for 7.4% of MOT failures on the Harley Davidson Unclassified. 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 — 4.3% of failures
Motorcycle brakes issues account for 4.3% of MOT failures on the Harley Davidson Unclassified. 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 lamps and reflectors — 3.4% of failures
Motorcycle lamps and reflectors issues account for 3.4% of MOT failures on the Harley Davidson Unclassified. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Frequently Asked Questions
What is the MOT pass rate for the Harley Davidson Unclassified?
Based on 40,344 MOT tests in our database, the Harley Davidson Unclassified has an overall pass rate of 86.1% (13.9% fail rate).
What are the most common MOT failures on a Harley Davidson Unclassified?
The top 3 reasons a Harley Davidson Unclassified fails its MOT are: 1. Motorcycle lighting and signalling (7.4%), 2. Motorcycle brakes (4.3%), 3. Motorcycle lamps and reflectors (3.4%). Check these areas before booking your MOT.
Is the Harley Davidson Unclassified reliable?
With a 13.9% MOT failure rate, the Unclassified is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Harley Davidson Unclassified?
Based on failure data, focus on: Motorcycle lighting and signalling (7.4%); Motorcycle brakes (4.3%); Motorcycle lamps and reflectors (3.4%). 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.