| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 47 |
| Registration plate issues | 36 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 22 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 18 |
| Horn not working |1.7.3a| | 16 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 12 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 12 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Rear reflector on motorcycle missing |1.4.1| | 8 |
| Drive chain excessively loose |6.2.1d| | 8 |
| Horn not working (7.7 (a)) | 7 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Stop lamp remains on when the brakes are released | 5 |
| Rear Position lamp not working (4.2.1 (a)) | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 5 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Nearside Direction indicators not working |1.5.1c| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 3 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Horn not working |7.7 |a| |ii|| | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 2 |
| Nearside Front Footrest insecure |6.2.1a| | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Offside Steering lock stop maladjusted |2.1.3| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 2 |
| Rear Stop lamp does not illuminate immediately a brake applies (1.3.1a) | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 2 |
| Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 2 |
| Headlamp light intensity severely reduced (4.1.4 (a)) | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Rear Wheel spindle locking device missing (5.2.1 (d)) | 2 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 2 |