KTM 390 vs Suzuki AN400

The KTM 390 passes its MOT first time more often than the Suzuki AN400: 86.4% vs 86.2%, a 0.2-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	KTM 390	Suzuki AN400
First-time pass rate	86.4%	86.2%
Outright fail rate	7.2%	9.8%
Vs comparable bikes (age & mileage adjusted)	-2.0 pts	+1.3 pts
Engine size	373cc	385cc
Rank among all models	#2091 of 5428	#2148 of 5428
Median miles at test	5,598	15,861
MOT tests analysed	3,737	27,056
Most common failure	lamps and reflectors	brakes

First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.

"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.

What fails, side by side

share of each bike's MOT tests that failed on the component · lower is better

Component	KTM 390	Suzuki AN400
Brakes	2.0%	4.4%
Lights & signalling	3.0%	2.6%
Tyres & wheels	1.5%	3.2%
Steering & suspension	1.4%	2.3%
Structure & body	2.1%	0.3%
Fuel & exhaust	0.0%	0.4%
Drive system	0.1%	0%

A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	KTM 390	Suzuki AN400
2018	85.7%	85.7%
2019	86.4%	84.4%
2020	86.9%	84.5%
2021	86.1%	85.1%
2022	87.7%	83.0%
2023	86.6%	83.0%
2024	85.9%	83.1%
2025	86.8%	86.9%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	KTM 390	Suzuki AN400
0k-10k miles	87.8%	91.7%
10k-20k miles	82.0%	86.7%
20k-30k miles	78.9%	82.7%

Bands with fewer than 30 tests for either bike are left out.

KTM 390 vs Suzuki AN400 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the KTM 390 or the Suzuki AN400?

The KTM 390 passes its MOT first time more often than the Suzuki AN400: 86.4% vs 86.2%, a 0.2-point lead. Adjusted for age, mileage and test class, the Suzuki AN400 still comes out ahead: -2.0 points vs comparable bikes for the KTM 390, +1.3 for the Suzuki AN400. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the KTM 390 fail its MOT on most?

Lights & signalling: 3.0% of KTM 390 MOT tests failed on it, then structure & body (2.1%).

What does the Suzuki AN400 fail its MOT on most?

Brakes: 4.4% of Suzuki AN400 MOT tests failed on it, then tyres & wheels (3.2%).

Which holds up better at high mileage, the KTM 390 or the Suzuki AN400?

At 20k-30k miles the Suzuki AN400 passes first time more often: 78.9% for the KTM 390 vs 82.7% for the Suzuki AN400.

KTM 390 86.4% pass · 3,737 tests SUZUKI AN400 86.2% pass · 27.1k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.