Honda CB400NB
Real ownership data from 609 UK CB400NB motorcycles — mileage, MOT pass rates and the faults that actually come up, taken from DVSA test records rather than opinion.
Most common CB400NB problems
Ranked by how often each fault appears in this model's MOT history.
| Fault | Severity | Share of faults |
|---|---|---|
| Lights and indicators | major | 8.7% |
| Brakes | fail | 6.8% |
| Suspension | major | 6.8% |
| Steering and head bearings | fail | 3.9% |
| Wheels | fail | 2.9% |
| Other | fail | 2.9% |
| Tyres | fail | 2.9% |
| Exhaust and emissions | major | 1.9% |
Advisories (wear noted but not failed) are excluded above; the most common is suspension.
CB400NB 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 |
|---|---|---|---|---|
| 1985 | 11 | 18,150 mi | 97 | 33.33% |
| 1984 | 75 | 36,396 mi | 1,470 | 86.36% |
| 1983 | 409 | 34,580 mi | 238 | 85.19% |
| 1982 | 108 | 27,283 mi | 73 | 80% |
CB400NB questions, answered with data
What are the most common problems with the Honda CB400NB?
Across 609 UK examples, the most frequently recorded MOT faults are lights and indicators (8.7% of all recorded faults), brakes (6.8% of all recorded faults), suspension (6.8% of all recorded faults).
What is average mileage for a Honda CB400NB?
The median Honda CB400NB in the UK has covered 32,477 miles, and typically rides about 238 miles a year. Half of all examples fall between 22,347 and 37,346 miles.
Is the Honda CB400NB reliable?
81.98% of Honda CB400NB MOT tests are passed first time, with an average of 0.82 faults recorded per test. This is measured from DVSA MOT records, not owner opinion.
Based on DVSA MOT test records for 609 Honda CB400NB motorcycles registered in Great Britain and Northern Ireland. Contains public sector information licensed under the Open Government Licence v3.0.