| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 307 |
| Registration plate issues | 85 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 43 |
| Rear reflector on motorcycle missing |1.4.1| | 41 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 35 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 27 |
| Rear reflector missing (4.8.2 (a) (ii)) | 23 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Drive chain excessively loose |6.2.1d| | 16 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 14 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 13 |
| Riders seat insecure |6.2.1a| | 13 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 11 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 10 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 10 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 9 |
| Horn not working |1.7.3a| | 9 |
| Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Throttle operating incorrectly |6.2.1f| | 9 |
| 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| | 9 |
| Rear Brake excessively binding (1.2.1 (f)) | 9 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Headlamp aim beam image kick up to the offside |1.6| | 8 |
| Front Position lamp not working (4.2.1 (a)) | 8 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Front Brake excessively binding (1.2.1 (f)) | 8 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 8 |
| Headlamp insecure |1.2.3b| | 7 |
| Front Brake excessively binding |1.2.1 |f|| | 7 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 7 |
| Front wheel bearings are excessively rough |2.3.5b| | 6 |
| Horn not working |7.7 |a| |ii|| | 6 |
| Rear reflector missing |4.8.2 |a| |ii|| | 6 |
| Stop lamp remains on when the brakes are released | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Rear Brake excessively binding |1.2.1 |f|| | 6 |
| Registration plate lamp issues | 6 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Front position lamp insecure |1.1.1c| | 4 |
| Rear Exhaust markings indicating not for road use or similar wording |7.1.4| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 4 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Front Position lamp not working |4.2.1 |a|| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |