Suzuki An 400 AL8 vs Suzuki AN400

The Suzuki An 400 AL8 passes its MOT first time more often than the Suzuki AN400: 94.3% vs 86.2%, a 8.1-point lead.

MOT reliability, side by side

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

Metric	Suzuki An 400 AL8	Suzuki AN400
First-time pass rate	94.3%	86.2%
Outright fail rate	3.6%	9.8%
Vs comparable bikes (age & mileage adjusted)	+6.2 pts	+1.3 pts
Engine size	400cc	385cc
Rank among all models	#139 of 5428	#2148 of 5428
Median miles at test	6,993	15,861
MOT tests analysed	1,002	27,056
Most common failure	brakes	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	Suzuki An 400 AL8	Suzuki AN400
Brakes	2.5%	4.4%
Tyres & wheels	0.6%	3.2%
Lights & signalling	0.2%	2.6%
Steering & suspension	0.3%	2.3%
Fuel & exhaust	0%	0.4%
Structure & body	0.1%	0.3%

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	Suzuki An 400 AL8	Suzuki AN400
2020	88.1%	84.5%
2021	92.6%	85.1%
2022	97.3%	83.0%
2023	96.8%	83.0%
2024	94.5%	83.1%
2025	90.6%	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	Suzuki An 400 AL8	Suzuki AN400
0k-10k miles	94.8%	91.7%
10k-20k miles	94.4%	86.7%
20k-30k miles	88.9%	82.7%

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

Suzuki An 400 AL8 vs Suzuki AN400 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Suzuki An 400 AL8 or the Suzuki AN400?

The Suzuki An 400 AL8 passes its MOT first time more often than the Suzuki AN400: 94.3% vs 86.2%, a 8.1-point lead. Adjusted for age, mileage and test class, the Suzuki An 400 AL8 still comes out ahead: +6.2 points vs comparable bikes for the Suzuki An 400 AL8, +1.3 for the Suzuki AN400. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Suzuki An 400 AL8 fail its MOT on most?

Brakes: 2.5% of Suzuki An 400 AL8 MOT tests failed on it, then tyres & wheels (0.6%).

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 Suzuki An 400 AL8 or the Suzuki AN400?

At 20k-30k miles the Suzuki An 400 AL8 passes first time more often: 88.9% for the Suzuki An 400 AL8 vs 82.7% for the Suzuki AN400.

SUZUKI AN 400 AL8 94.3% pass · 1,002 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.