Yamaha Unknown (1980)
1980 Yamaha Unknown
CarHunch analysed 49,770 real MOT records for the 1980 Yamaha Unknown. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
This 1980 Yamaha has a 70% first-time MOT pass rate, which is 10 percentage points below the UK average of 80%, suggesting these older bikes are more likely to need work before passing. The zero dangerous defects across nearly 50,000 vehicles is genuinely reassuring—there's no hidden safety crisis here.
The median mileage of just 17,026 miles indicates these are either museum pieces or very lightly used survivors, which explains why failures and advisories average zero per vehicle. If you're considering one, have an independent inspection done regardless of MOT history, since the low mileage and age mean mechanical surprises (carburetor varnish, fuel system degradation, rubber perishing) are more likely than the MOT will catch.
What to check before buying a 1980 Yamaha 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 Yamaha Unknown
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (100%) | 49,757 | 0.7% | 0 |
| Other (0%) | 10 | 100% | 0 |
| Diesel (0%) | 3 | 0% | 0 |
Mileage Distribution
Most 1980 Yamaha 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.
Half of all 1980 Yamaha Unknown vehicles fall between 7,039 and 26,079 miles.
1980 Yamaha Unknown — Still on the Road
Numbers are declining — 20 vehicles still getting MOTs in 2025 (17% of peak).
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2016–2025.
MOT History Averages
Most Common MOT Issues — 1980 Yamaha Unknown
Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.
-
11.6%
Exhaust noisy
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8.1%
Steering headbearing has slight free play
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6.4%
Rear Brake indicates slight fluctuation of brake effort
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5%
Chain guard missing ()
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4.4%
Rear reflector missing
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4.1%
Exhaust noisy
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4.1%
Front Brake indicates slight fluctuation of brake effort
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3.7%
Steering headbearing slightly stiff or notchy
Data covers a 3-year window centred on 1980. Counts include advisories and failures.
Found a specific Yamaha Unknown?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.