SYM JET 4 125 E4 MOT pass rate and common failures
SYM JET 4 125 E4 motorcycles pass the MOT 74.69% of the time, measured across 241 tests in the DVSA record. A further 5.81% passed only after a defect was put right at the test station.
What to check before the MOT
Built from this model's own failure record, not general advice.
- Start with excessively binding - it accounts for 29.8% of failed tests on this model.
- Then check has a serious fluid leak and not working, the next two most common reasons.
- The most common advisory is tread depth is below minimum requirements of 1.0mm (10% of all tests) - not a failure, but money you will spend sooner or later.
- Average recorded mileage at test is 12,346 miles, which is the number to compare any advert against.
Pass rate by age
A single pass rate hides the most useful thing in this data: how the same model behaves at three years old and at fifteen.
| Age at test | Pass rate | Tests | |
|---|---|---|---|
| 3-5 years | 75.54% | 139 | |
| 6-10 years | 73.53% | 102 |
Why the SYM JET 4 125 E4 fails
Share of failed tests on this model where the item was recorded. One test can fail on several items, so the column does not add up to 100%.
| # | Item | Of failures | Tests | |
|---|---|---|---|---|
| 1 | Excessively binding | 29.8% | 14 | |
| 2 | Has a serious fluid leak | 23.4% | 11 | |
| 3 | Not working | 23.4% | 11 | |
| 4 | Has insufficient reserve travel | 14.9% | 7 | |
| 5 | Tread depth is below minimum requirements of 1.0mm | 14.9% | 7 | |
| 6 | Lens defective which has no effect on emitted light | 12.8% | 6 | |
| 7 | Less than 1.0 mm thick | 12.8% | 6 | |
| 8 | The less effective brake control does not achieve an efficiency of 25% | 12.8% | 6 | |
| 9 | Not working on dipped beam | 10.6% | 5 | |
| 10 | Has a major leak of exhaust gases | 8.5% | 4 |
Most common advisories
Not a failure and not a legal requirement to fix - but an advisory that repeats year after year is money the next owner spends.
| # | Item | Of all tests | Tests | |
|---|---|---|---|---|
| 1 | Tread depth is below minimum requirements of 1.0mm | 10% | 24 | |
| 2 | Is bent and the brake cannot be readily applied | 5.8% | 14 | |
| 3 | Excessively binding | 4.6% | 11 | |
| 4 | Is so short that the brake cannot be readily applied | 4.6% | 11 | |
| 5 | Has a serious fluid leak | 4.1% | 10 | |
| 6 | Less than 1.0 mm thick | 3.7% | 9 | |
| 7 | Noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition | 3.3% | 8 | |
| 8 | Has a major leak of exhaust gases | 2.9% | 7 | |
| 9 | Has excessive wear or free play | 2.5% | 6 | |
| 10 | In such a condition that it is seriously weakened | 2.1% | 5 |
SYM JET 4 125 E4 for sale
No SYM JET 4 125 E4 in stock at the moment - 9,173 other SYM bikes are advertised.
Similar bikes compared
Models of comparable capacity, so the comparison means something.
| Model | Tests | Pass rate | Avg mileage | |
|---|---|---|---|---|
| Yamaha GPD125-A NMAX 125 · 125cc | 8,762 | 80.8% | 45,039 | |
| Piaggio VESPA 79-210cc · 79-210cc | 8,363 | 85.42% | 11,710 | |
| Honda WW · 125cc | 7,252 | 80.32% | 40,134 | |
| Honda WW 125 A-M · 125cc | 5,011 | 84.06% | 29,846 | |
| Honda GLR · 125cc | 4,737 | 79.99% | 14,642 | |
| Honda CBF 100-125cc · 100-125cc | 3,204 | 77% | 15,203 |
Source: DVSA MOT testing data, 2025 · updated Aug 2026 · licence and method