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Ktm

390 Duke 17

578 MOT tests analysed. sits above the UK fleet average — here's where 390 Duke 17s pass, fail, and end up on the retest sheet.

That's 10.4 points above the UK fleet average across our 1,988 tracked models — a confident result.

Pass

86.2%

Pass-after-fix

6.1%

Fail

7.6%

Avg miles

6,429

Pass + Pass-after-fix + Fail = 100%

The picture

390 Duke 17: a strong MOT record by UK norms

Across 578 MOT tests, the 390 Duke 17 returns 86.2% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a missing rear reflector. Tyre tread under the limit and brake efficiency below minimum requirement round out the top three. Average tested mileage sits at 6,429, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.

Top ten reasons for rejection.

  1. 01

    Reflector missing or reflecting white to the rear

    9 occurrences · 1.6% of tests

  2. 02

    Tyre tread depth not in accordance with the requirements

    7 occurrences · 1.2% of tests

  3. 03

    Brake efficiency below minimum requirement

    5 occurrences · 0.9% of tests

  4. 04

    Significant brake effort recorded with no brake applied indicating a binding brake

    5 occurrences · 0.9% of tests

  5. 05

    Reflector colour or position not in accordance with the requirements

    5 occurrences · 0.9% of tests

  6. 06

    Rate of flashing not between 60 and 120 times per minute

    3 occurrences · 0.5% of tests

  7. 07

    A shock absorber not functioning or leaking severely

    3 occurrences · 0.5% of tests

  8. 08

    Number plate showing an incorrect registration

    2 occurrences · 0.3% of tests

  9. 09

    Number plate does not conform to the specified requirements

    2 occurrences · 0.3% of tests

  10. 10

    Flexible brake hose slightly damaged, chafed or twisted

    2 occurrences · 0.3% of tests

Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.

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Tools that pre-empt a retest.

Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.

Item 01 · Amazon UK

Digital tyre-tread depth gauge

Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.

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Buying or keeping a 390 Duke 17?

Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.

If you own a 390 Duke 17 and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.