Bsa B44 vs Suzuki AN400

The Bsa B44 passes its MOT first time more often than the Suzuki AN400: 90.2% vs 86.2%, a 4.0-point lead.

MOT reliability, side by side

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

Metric	Bsa B44	Suzuki AN400
First-time pass rate	90.2%	86.2%
Outright fail rate	3.9%	9.8%
Vs comparable bikes (age & mileage adjusted)	+0.4 pts	+1.3 pts
Engine size	441cc	385cc
Rank among all models	#884 of 5428	#2148 of 5428
Median miles at test	8,685	15,861
MOT tests analysed	620	27,056
Most common failure	steering and suspension	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	Bsa B44	Suzuki AN400
Brakes	0.5%	4.4%
Lights & signalling	1.9%	2.6%
Tyres & wheels	1.0%	3.2%
Steering & suspension	1.8%	2.3%
Structure & body	0.5%	0.3%
Fuel & exhaust	0.2%	0.4%
Drive system	0.5%	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	Bsa B44	Suzuki AN400
2010	93.5%	86.9%
2011	95.0%	84.6%
2012	90.5%	85.5%
2013	92.2%	86.9%
2014	88.1%	85.0%
2015	89.8%	86.6%
2016	95.7%	85.5%
2017	94.2%	86.8%

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	Bsa B44	Suzuki AN400
0k-10k miles	89.8%	91.7%
10k-20k miles	93.1%	86.7%
20k-30k miles	91.4%	82.7%

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

Bsa B44 vs Suzuki AN400 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Bsa B44 or the Suzuki AN400?

The Bsa B44 passes its MOT first time more often than the Suzuki AN400: 90.2% vs 86.2%, a 4.0-point lead. Adjusted for age, mileage and test class the two are level (+0.4 vs +1.3 points against comparable bikes), so the raw gap is mostly down to how old and how used each fleet is. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Bsa B44 fail its MOT on most?

Lights & signalling: 1.9% of Bsa B44 MOT tests failed on it, then steering & suspension (1.8%).

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 Bsa B44 or the Suzuki AN400?

At 20k-30k miles the Bsa B44 passes first time more often: 91.4% for the Bsa B44 vs 82.7% for the Suzuki AN400.

BSA B44 90.2% pass · 620 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.