| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 137 |
| Registration plate issues | 113 |
| Rear reflector on motorcycle missing |1.4.1| | 65 |
| Registration plate lamp issues | 59 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 41 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 36 |
| Rear reflector missing (4.8.2 (a) (ii)) | 30 |
| Drive chain excessively loose |6.2.1d| | 25 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 17 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 16 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 14 |
| Rear reflector missing |4.8.2 |a| |ii|| | 12 |
| Front wheel bearings have excessive free play |2.3.5b| | 11 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 10 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Drive chain worn to excess |6.2.1e| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 9 |
| Horn not working |1.7.3a| | 9 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 8 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Horn not working (7.7 (a)) | 7 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |
| 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| | 7 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 7 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Throttle operating incorrectly |6.2.1f| | 6 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 6 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Stop lamp remains on when the brakes are released | 6 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 6 |
| Offside Front Direction indicator not working |1.5.1c| | 6 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 5 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 5 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 5 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 5 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 4 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 4 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 4 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 4 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 4 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Nearside Rear Direction indicator not working |1.5.1c| | 4 |