| Most common failures | No# failures |
|---|
| Registration plate issues | 121 |
| Headlamp aim out of alignment | 55 |
| Rear reflector on motorcycle missing |1.4.1| | 30 |
| Exhaust noise is clearly in excess of that emitted by a similar motor bicycle fitted with a standard silencer in average condition |7.1.2| | 19 |
| Rear reflector missing (4.8.2 (a) (ii)) | 13 |
| Rear Position lamp not working (4.2.1 (a)) | 12 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 10 |
| Stop lamp remains on when the brakes are released | 9 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 8 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Front wheel bearings are excessively rough |2.3.5b| | 7 |
| Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 6 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 4 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Registration plate lamp issues | 4 |
| Horn not working |1.7.3a| | 3 |
| Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Horn not working (7.7 (a)) | 3 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 2 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 2 |
| Offside Front Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 2 |
| Nearside Front Direction indicator not working |1.5.1c| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Front Direction indicator affected by the operation of another lamp |1.5.1c| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |