AJS NAC 12

124cc Petrol Class 1

#5169 of 5426 overall #39 of 45 AJSs #602 of 734 commuter bikes

61.3%

first-time pass rate

21.8%

failed outright

5,772

median miles at test

463

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2013–2017

The NAC 12's first-time pass rate has fallen 6.4 points since 2013, 68.2% to 61.8%.

What fails on a NAC 12

failure defects by component group · advisories excluded

Component group	Defects	% of defects
lighting and signalling	83	26.9
steering and suspension	58	18.8
brakes	44	14.3
body and structure	32	10.4
drive system	22	7.1
structure and attachments	22	7.1
lamps and reflectors	18	5.8
tyres and wheels	11	3.6
driving controls	10	3.2
suspension	8	2.6

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 NAC 12 beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests GILERA RUNNER 70.8% pass · 69.9k tests

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 NAC 12.

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Best year to buy used: 2010 (68.9% pass). Weakest: 2011 (52.0%).

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.