Norton F1 vs Suzuki GSF600

The Norton F1 passes its MOT first time more often than the Suzuki GSF600: 94.1% vs 77.3%, a 16.8-point lead.

MOT reliability, side by side

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

Metric	Norton F1	Suzuki GSF600
First-time pass rate	94.1%	77.3%
Outright fail rate	3.2%	14.2%
Vs comparable bikes (age & mileage adjusted)	+9.3 pts	-6.1 pts
Engine size	588cc	599cc
Rank among all models	#153 of 5428	#4013 of 5428
Median miles at test	11,307	21,080
MOT tests analysed	407	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.

"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.

Pass rate by test year

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

Test year	Norton F1	Suzuki GSF600
2006	95.5%	81.8%
2007	95.0%	80.0%
2008	97.0%	78.4%
2009	86.1%	75.8%

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	Norton F1	Suzuki GSF600
0k-10k miles	95.8%	86.8%
10k-20k miles	93.5%	80.1%
20k-30k miles	94.7%	75.2%

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

NORTON F1 94.1% pass · 407 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.