Ajs Model 20 vs Suzuki SV650S

The Ajs Model 20 passes its MOT first time more often than the Suzuki SV650S: 90.3% vs 80.6%, a 9.7-point lead.

MOT reliability, side by side

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

Metric	Ajs Model 20	Suzuki SV650S
First-time pass rate	90.3%	80.6%
Outright fail rate	3.2%	11.9%
Engine size	500cc	645cc
Rank among all models	#854 of 5428	#3459 of 5428
Median miles at test	16,829	16,958
MOT tests analysed	308	84,632
Most common failure	steering and suspension	lighting and signalling

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	Ajs Model 20	Suzuki SV650S
2006	100.0%	85.9%
2007	88.2%	85.5%
2009	86.1%	80.5%
2010	85.3%	80.3%
2011	88.2%	80.0%
2012	90.0%	78.8%

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	Ajs Model 20	Suzuki SV650S
0k-10k miles	86.8%	88.2%
10k-20k miles	94.0%	81.6%
20k-30k miles	94.7%	76.9%
30k-40k miles	87.1%	73.6%

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

AJS MODEL 20 90.3% pass · 308 tests SUZUKI SV650S 80.6% pass · 84.6k tests

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