Should I check the MOT history before buying a 1991 Triumph Unknown?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 1991 Triumph Unknown?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 1991 Triumph Unknown?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

Do I need an HPI check when buying a 1991 Triumph Unknown?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Triumph Unknown (1991)

195 real MOT outcomes analysed • 8.1% first-time pass rate

1991 Triumph Unknown

CarHunch analysed 195 real MOT records for the 1991 Triumph Unknown. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.

Below average reliability 71.9% below UK average

8.1%

pass MOT first time

UK average: ~80%

16,101

typical mileage

4,585–31,585 middle half

1.5%

ever had a dangerous defect

recorded at any MOT

0.03

avg MOT failures per car

over 1.2 tests on record

What to check before buying a 1991 Triumph Unknown

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 Triumph Unknown

MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.

Inspection

Have a qualified mechanic check this car before you commit to buying →

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Mileage Distribution

Most 1991 Triumph Unknown 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.

4,585

low mileage

16,101

typical

31,585

high mileage

Half of all 1991 Triumph Unknown vehicles fall between 4,585 and 31,585 miles.

MOT History Averages

1.2

Avg MOT tests per vehicle

0.03

Avg failures per vehicle

0.2

Avg advisories per vehicle

Most Common MOT Issues — 1991 Triumph Unknown

Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.

45.5%

Exhaust noisy
18.2%

oil leaks from engine
18.2%

frame and suspension has been modified
18.2%

Drive chain worn but not considered excessive
18.2%

oil leaks from oil tank
18.2%

play between rear brake drum/sprocket and wheel
18.2%

fuel cap seal perrished
18.2%

Rear suspension appears soft on bounce

Data covers a 3-year window centred on 1991. Counts include advisories and failures.

Found a specific Triumph Unknown?

Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.

Other model years — Triumph Unknown:

1980 1981 1982 1983 1992 1993 1994 1995 1996 1997 2015 2016 2017 2018 2019 2020 2023 2024 2025