BIKERELIABILITY
MOT DATA · GREAT BRITAIN · 2005–2025
Model report · 2005–2025

NORTON 18

497cc Petrol Class 2
#67 of 5426 overall #2 of 34 NORTONs #43 of 2787 other bikes
95.1%
first-time pass rate
1.3%
failed outright
10,096
median miles at test
387
MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2006–2012

The 18's first-time pass rate has fallen 4.1 points since 2006, 95.3% to 91.2%.

90%95%100%2006: 95.3% pass (64 tests)2007: 98.0% pass (50 tests)2008: 95.6% pass (45 tests)2009: 93.2% pass (44 tests)2010: 96.0% pass (50 tests)2011: 93.5% pass (46 tests)2012: 91.2% pass (34 tests)20062012

What fails on a 18

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects
brakes
4 30.8
lighting and signalling
3 23.1
steering and suspension
3 23.1
audible warning (Horn)
1 7.7
lamps and reflectors
1 7.7
tyres
1 7.7

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the 18 beats 4 of its 4 closest rivals (KAWASAKI ZX-6R, SUZUKI GSF600, YAMAHA FZS600).

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the 18.