Norton 50 vs Suzuki AN400

The Norton 50 passes its MOT first time more often than the Suzuki AN400: 91.5% vs 86.2%, a 5.3-point lead.

MOT reliability, side by side

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

Metric	Norton 50	Suzuki AN400
First-time pass rate	91.5%	86.2%
Outright fail rate	0.8%	9.8%
Engine size	350cc	385cc
Rank among all models	#567 of 5428	#2148 of 5428
Median miles at test	19,595	15,861
MOT tests analysed	365	27,056
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 50	Suzuki AN400
2006	95.0%	91.0%
2007	90.7%	88.6%
2008	91.9%	87.6%
2009	90.3%	87.0%
2011	86.8%	84.6%

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 50	Suzuki AN400
0k-10k miles	85.7%	91.7%
10k-20k miles	95.1%	86.7%
20k-30k miles	90.6%	82.7%
30k-40k miles	97.7%	81.0%

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

NORTON 50 91.5% pass · 365 tests SUZUKI AN400 86.2% pass · 27.1k tests

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