Yamaha Dt125 (1999)
1999 Yamaha Dt125
CarHunch analysed 317 real MOT records for the 1999 Yamaha Dt125. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 1999 Yamaha DT125 sits slightly below the UK average with a 75.9% first-time pass rate against the national 80%, and one in five of these bikes (21.8%) have recorded a dangerous defect at some point—a meaningful concern for buyers prioritising safety. Age and mileage are working in the bike's favour: at nearly 18 years old, the median 16,743 miles is genuinely low, suggesting these machines have been lightly used or well-preserved.
However, the average DT125 is still accumulating 2.24 failures and 7.2 advisories per test, which points to the routine wear you'd expect from ageing smallbikes—corroded fasteners, worn cables, and tired brakes are the likely culprits rather than systemic design flaws. Before committing, ask the seller for the full MOT history and have an independent mechanic inspect the ignition and charging system, two areas where these older Yamahas commonly develop expensive problems.
What to check before buying a 1999 Yamaha Dt125
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.
- ⚠️ 21.8% of these vehicles have had a dangerous defect recorded. Enter the reg below — the full MOT history will show exactly what was flagged and whether it was resolved.
- 📄 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 Dt125
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Mileage Distribution
Most 1999 Yamaha Dt125 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 1999 Yamaha Dt125 vehicles fall between 10,740 and 23,219 miles.
1999 Yamaha Dt125 — Still on the Road
52 vehicles still getting MOTs in 2025 — 63% of the peak remain.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
MOT History Averages
Most Common MOT Issues — 1999 Yamaha Dt125
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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30%
Drive chain worn but not considered excessive
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29.4%
Rear Tyre worn close to the legal limit
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24.3%
Drive chain slightly loose
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24.1%
Front Tyre worn close to the legal limit
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22%
Rear reflector on motorcycle missing
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21.3%
Headlamp aim too high
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20%
Rear Brake disc(s) slightly worn
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18.9%
Front Wheel spoke slightly loose.
Data covers a 3-year window centred on 1999. Counts include advisories and failures.
Found a specific Yamaha Dt125?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.