BSA D14 4
Real ownership data from 72 UK D14 4 motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common D14 4 problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Lights and indicators | fail | 14% |
| Brakes | fail | 8.5% |
| Tyres | fail | 5.5% |
| Other | user entered | 4.9% |
| Wheels | fail | 3.7% |
| Steering and head bearings | fail | 3.1% |
| Suspension | fail | 1.8% |
| Controls and cables | prs | 0.6% |
Advisories (wear noted but not failed) are excluded above; the most common is wheels.
D14 4 mileage and reliability by year
Use this to judge whether a specific bike is high or low mileage for its age.
| Year | Examples | Median mileage | Miles/year | First-time pass |
|---|---|---|---|---|
| 1970 | 8 | 10,756 mi | 34 | 96.3% |
| 1969 | 10 | 14,616 mi | 157 | 82.93% |
| 1968 | 37 | 10,219 mi | 31 | 86.18% |
| 1967 | 7 | 17,990 mi | 16 | 83.33% |
D14 4 questions, answered with data
What are the most common problems with the BSA D14 4?
Across 72 UK examples, the most frequently recorded MOT faults are lights and indicators (14% of all recorded faults), brakes (8.5% of all recorded faults), tyres (5.5% of all recorded faults).
What is average mileage for a BSA D14 4?
The median BSA D14 4 in the UK has covered 11,232 miles, and typically rides about 38 miles a year. Half of all examples fall between 3,449 and 18,260 miles.
Is the BSA D14 4 reliable?
86.62% of BSA D14 4 MOT tests are passed first time, with an average of 0.56 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 72 BSA D14 4 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.