| Most common failures | No# failures |
|---|
| Registration plate issues | 86 |
| Rear reflector on motorcycle missing |1.4.1| | 74 |
| Headlamp aim out of alignment | 50 |
| Horn not working |1.7.3a| | 42 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 25 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 22 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Rear reflector missing (4.8.2 (a) (ii)) | 17 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 14 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 13 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 12 |
| Horn missing |1.7.1| | 12 |
| Rear Position lamp not working (4.2.1 (a)) | 11 |
| Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 6 |
| Horn not working (7.7 (a)) | 5 |
| Registration plate lamp issues | 5 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Headlamp aim not tested (4.1.2 (b)) | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Rear Position lamp not working |4.2.1 |a|| | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 3 |
| Front Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 3 |
| Rear Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 3 |
| Rear position lamp does not illuminate immediately when it is switched on (1.1.3a) | 3 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Drive chain excessively loose |6.2.1d| | 2 |
| Rear Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Front Wheel bearing rough when rotated |5.1.3 |b| |i|| | 2 |
| Drive chain horseshoe locking device incorrectly fitted |6.1.7 |j| |i|| | 2 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 2 |
| 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| | 2 |
| Rear Wheel spoke excessively loose |4.2.1b| | 2 |
| Front Stop lamp missing |1.3.3a| | 2 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 2 |
| Front Wheel bearing has excessive play |5.1.3 |a| |i|| | 2 |
| Rear Wheel bearing has excessive play |5.1.3 |a| |i|| | 2 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Rear reflector on sidecar missing |1.4.1| | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front Position lamp not working (4.2.1 (a)) | 2 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Steering headbearing has excessive free play |2.2.2| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Rear reflector on motorcycle missing (1.4.1) | 2 |