Ajs Firefox (2017)
2017 Ajs Firefox
CarHunch analysed 127 real MOT records for the 2017 Ajs Firefox. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2017 AJS Firefox has a first-time pass rate of 62.2%, which is nearly 18 percentage points below the UK average of 80%—a meaningful warning sign for reliability. Dangerous defects have appeared in 13.4% of tested examples, suggesting you should factor in closer pre-purchase inspection and a higher contingency budget for repairs.
These bikes are running around 7,690 miles at median age, which is relatively low usage, yet they're still picking up an average of 0.63 failures and 2.1 advisories per test—indicating problems aren't simply down to neglect or high mileage. Before committing to purchase, get a trusted mechanic to inspect the electrical system, brake lines, and exhaust mountings, as these categories typically drive the failure rate on this model.
What to check before buying a 2017 Ajs Firefox
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Ajs Firefox
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Mileage Distribution
Most 2017 Ajs Firefox vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2017 Ajs Firefox vehicles fall between 4,973 and 10,593 miles.
2017 Ajs Firefox — Still on the Road
Numbers are declining — 16 vehicles still getting MOTs in 2025 (21% of peak).
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2020–2025.
MOT History Averages
Most Common MOT Issues — 2017 Ajs Firefox
Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.
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18.6%
COVID-19 6 MONTH EXTENSION
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18.2%
Nearside Front Shock absorber has a light misting of oil
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16.4%
Offside Front Shock absorber has a light misting of oil
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14.5%
Rear Tyre worn close to the legal limit
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14.1%
Headlamp not working on dipped beam
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13.2%
Front Shock absorber has a light misting of oil
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12.3%
Roller brake test The less effective brake control does not achieve an efficiency of 25%
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11.4%
Steering headbearing has slight free play
Data covers a 3-year window centred on 2017. Counts include advisories and failures.
Found a specific Ajs Firefox?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.