Bsa A7SS vs Yamaha FZS600

The Bsa A7SS passes its MOT first time more often than the Yamaha FZS600: 90.6% vs 82.6%, a 8.0-point lead.

MOT reliability, side by side

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

Metric	Bsa A7SS	Yamaha FZS600
First-time pass rate	90.6%	82.6%
Outright fail rate	2.1%	10.6%
Engine size	500cc	599cc
Rank among all models	#776 of 5428	#3052 of 5428
Median miles at test	6,130	21,612
MOT tests analysed	385	136,558
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.

Pass rate by test year

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

Test year	Bsa A7SS	Yamaha FZS600
2006	90.0%	86.0%
2007	91.4%	84.1%
2008	88.6%	83.4%
2009	83.7%	81.2%
2010	93.3%	82.0%
2011	97.1%	81.1%
2012	90.6%	80.2%

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 A7SS	Yamaha FZS600
0k-10k miles	87.4%	89.6%
10k-20k miles	95.9%	85.5%
30k-40k miles	97.4%	78.7%

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

BSA A7SS 90.6% pass · 385 tests YAMAHA FZS600 82.6% pass · 137k tests

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