Yamaha DT400
Real ownership data from 132 UK DT400 motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common DT400 problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Lights and indicators | major | 29.9% |
| Brakes | dangerous | 5.5% |
| Electrical | major | 4.8% |
| Suspension | fail | 3.7% |
| Other | fail | 2.6% |
| Tyres | prs | 2.2% |
| Wheels | fail | 2.2% |
| Steering and head bearings | fail | 1.5% |
Advisories (wear noted but not failed) are excluded above; the most common is suspension.
DT400 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 |
|---|---|---|---|---|
| 2019 | 7 | 11,843 mi | 16,245 | 75% |
| 2017 | 9 | 7,724 mi | 336 | 92.31% |
| 2013 | 5 | 7,448 mi | 102 | 86.96% |
| 2011 | 5 | 4,415 mi | 56 | 84.21% |
| 2010 | 5 | 8,787 mi | 85 | 100% |
| 1978 | 16 | 9,204 mi | 139 | 71.43% |
| 1977 | 18 | 8,910 mi | 77 | 79.25% |
| 1976 | 17 | 7,744 mi | 68 | 89.74% |
| 1975 | 15 | 4,761 mi | 1 | 100% |
DT400 questions, answered with data
What are the most common problems with the Yamaha DT400?
Across 132 UK examples, the most frequently recorded MOT faults are lights and indicators (29.9% of all recorded faults), brakes (5.5% of all recorded faults), electrical (4.8% of all recorded faults).
What is average mileage for a Yamaha DT400?
The median Yamaha DT400 in the UK has covered 7,212 miles, and typically rides about 82 miles a year. Half of all examples fall between 3,808 and 12,013 miles.
Is the Yamaha DT400 reliable?
83.1% of Yamaha DT400 MOT tests are passed first time, with an average of 0.68 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 132 Yamaha DT400 motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.