Sym Jet 4 125 E4 (2020)
2020 Sym Jet 4 125 E4
CarHunch analysed 182 real MOT records for the 2020 Sym Jet 4 125 E4. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2020 SYM JET 4 125 is a significant reliability concern: just 47% pass their MOT first time, well below the UK average of 80%, and nearly 15% have suffered a dangerous defect at some point—a red flag for a four-year-old machine. This isn't a marginal issue; it's a pattern affecting nearly half of the vehicles tested.
At just over 11,000 miles median mileage for a 2020, these scooters are lightly used, yet they're still generating an average of 0.34 failures and 1.1 advisories per test. Before buying one, get a full pre-purchase inspection by someone familiar with SYM scooters, as the failures suggest either poor maintenance culture among owners or genuine design weaknesses—either way, you need to know what you're inheriting.
What to check before buying a 2020 Sym Jet 4 125 E4
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 Sym Jet 4 125 E4
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 (99%) | 180 | 46.3% | 0.34 |
| Other (1%) | 2 | 100% | 0 |
Mileage Distribution
Most 2020 Sym Jet 4 125 E4 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 2020 Sym Jet 4 125 E4 vehicles fall between 7,934 and 16,928 miles.
2020 Sym Jet 4 125 E4 — Still on the Road
64 vehicles still getting MOTs in 2025 — 77% of the peak remain.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2023–2025.
MOT History Averages
Found a specific Sym Jet 4 125 E4?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.