KTM 125 DUKE 21 MOT pass rate and common failures
KTM 125 DUKE 21 motorcycles pass the MOT 73.81% of the time, measured across 546 tests in the DVSA record. A further 8.61% passed only after a defect was put right at the test station.
What to check before the MOT
Built from this model's own failure record, not general advice.
- Start with missing - it accounts for 55.2% of failed tests on this model.
- Then check not working and excessively binding, the next two most common reasons.
- The most common advisory is excessively loose (6% of all tests) - not a failure, but money you will spend sooner or later.
- Average recorded mileage at test is 8,501 miles, which is the number to compare any advert against.
Pass rate by age
A single pass rate hides the most useful thing in this data: how the same model behaves at three years old and at fifteen.
| Age at test | Pass rate | Tests | |
|---|---|---|---|
| 3-5 years | 73.81% | 546 |
Why the KTM 125 DUKE 21 fails
Share of failed tests on this model where the item was recorded. One test can fail on several items, so the column does not add up to 100%.
| # | Item | Of failures | Tests | |
|---|---|---|---|---|
| 1 | Missing | 55.2% | 53 | |
| 2 | Not working | 19.8% | 19 | |
| 3 | Excessively binding | 16.7% | 16 | |
| 4 | Has a serious fluid leak | 14.6% | 14 | |
| 5 | Indicates excessive fluctuation of brake effort | 13.5% | 13 | |
| 6 | Too high | 12.5% | 12 | |
| 7 | Excessively loose | 11.5% | 11 | |
| 8 | Flashing more than 120 times a minute | 9.4% | 9 | |
| 9 | Does not illuminate by the operation of both brake controls | 7.3% | 7 | |
| 10 | Inoperative in the case of a single lamp or all lamps | 7.3% | 7 |
Most common advisories
Not a failure and not a legal requirement to fix - but an advisory that repeats year after year is money the next owner spends.
| # | Item | Of all tests | Tests | |
|---|---|---|---|---|
| 1 | Excessively loose | 6% | 33 | |
| 2 | Noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition | 6% | 33 | |
| 3 | Tread depth is below minimum requirements of 1.0mm | 5.5% | 30 | |
| 4 | Worn to excess | 5.5% | 30 | |
| 5 | Excessively binding | 4.2% | 23 | |
| 6 | Is so short that the brake cannot be readily applied | 3.8% | 21 | |
| 7 | Indicates excessive fluctuation of brake effort | 3.5% | 19 | |
| 8 | Less than 1.0 mm thick | 3.3% | 18 | |
| 9 | Has a serious fluid leak | 2.4% | 13 | |
| 10 | Sprocket worn to excess | 2.2% | 12 |
KTM 125 DUKE 21 for sale
No KTM 125 DUKE 21 in stock at the moment - 297 other KTM bikes are advertised.
Similar bikes compared
Models of comparable capacity, so the comparison means something.
| Model | Tests | Pass rate | Avg mileage | |
|---|---|---|---|---|
| Yamaha GPD125-A NMAX 125 · 125cc | 8,762 | 80.8% | 45,039 | |
| Piaggio VESPA 79-210cc · 79-210cc | 8,363 | 85.42% | 11,710 | |
| Honda WW · 125cc | 7,252 | 80.32% | 40,134 | |
| Honda WW 125 A-M · 125cc | 5,011 | 84.06% | 29,846 | |
| Honda GLR · 125cc | 4,737 | 79.99% | 14,642 | |
| Honda CBF 100-125cc · 100-125cc | 3,204 | 77% | 15,203 |
Source: DVSA MOT testing data, 2025 · updated Aug 2026 · licence and method