Norton Dominator 99 vs Suzuki GSF600

The Norton Dominator 99 passes its MOT first time more often than the Suzuki GSF600: 90.9% vs 77.3%, a 13.6-point lead.

MOT reliability, side by side

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

Metric	Norton Dominator 99	Suzuki GSF600
First-time pass rate	90.9%	77.3%
Outright fail rate	3.4%	14.2%
Engine size	600cc	599cc
Rank among all models	#705 of 5428	#4013 of 5428
Median miles at test	12,813	21,080
MOT tests analysed	471	143,023
Most common failure	lighting and signalling	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	Norton Dominator 99	Suzuki GSF600
2007	90.0%	80.0%
2008	88.6%	78.4%
2009	91.3%	75.8%
2010	86.7%	75.8%
2011	85.7%	76.1%
2012	92.9%	75.9%
2015	93.3%	75.5%
2016	90.3%	76.1%

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	Norton Dominator 99	Suzuki GSF600
0k-10k miles	89.2%	86.8%
10k-20k miles	91.5%	80.1%
20k-30k miles	87.5%	75.2%
30k-40k miles	98.4%	71.3%

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

NORTON DOMINATOR 99 90.9% pass · 471 tests SUZUKI GSF600 77.3% pass · 143k tests

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