AJS FIREFOX

49cc Petrol Class 1

#4776 of 5426 overall #27 of 45 AJSs #253 of 455 moped bikes

69.4%

first-time pass rate

21.9%

failed outright

6,168

median miles at test

1,537

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2015–2025

The FIREFOX's first-time pass rate has held steady since 2015 (73.5% → 73.3%).

Pass rate by mileage

how the FIREFOX's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage FIREFOX passes first time 71.1% of the time; by 20k that's 50.0%.

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a FIREFOX

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lamps and reflectors	292	34.3	7.6×
brakes	173	20.3	1.8×
suspension	112	13.2	7.5×
structure and attachments	72	8.5	5.7×
steering	67	7.9	10.2×
tyres	43	5.1	3.3×
lighting and signalling	37	4.3	0.4×
audible warning (Horn)	31	3.6	11.0×
steering and suspension	17	2	0.3×
Identification of the vehicle	7	0.8	2.0×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the FIREFOX beats 2 of its 4 closest rivals (PEUGEOT SPEEDFIGHT, PIAGGIO ZIP, PIAGGIO NRG).

PEUGEOT SPEEDFIGHT 65.2% pass · 83.7k tests PIAGGIO ZIP 71.3% pass · 79.0k tests PIAGGIO NRG 65.5% pass · 40.5k tests PEUGEOT VIVACITY 70.4% pass · 29.7k 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 FIREFOX.

Pass rate by registration year

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

Best year to buy used: 2019 (78.0% pass). Weakest: 2016 (64.7%).

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.

AJS FIREFOX FAQ

answers computed from the data above · terms in the glossary

Is the AJS FIREFOX reliable?

The AJS FIREFOX is less reliable than average for its class: 69.4% of its 1,537 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4776 of 5426 models.

What does a FIREFOX fail its MOT on most?

lamps and reflectors — 34% of all defects recorded against failed FIREFOX tests.

What is the best year of FIREFOX to buy used?

By first-time pass rate, 2019-registered examples do best (78.0%) and 2016 worst (64.7%). Condition and history still trump the year.

How many miles will a FIREFOX last?

The median FIREFOX shows 6,168 miles at test, and examples around 20k miles still pass 50.0% of the time — mileage alone rarely kills one.