| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 151 |
| Registration plate issues | 98 |
| Rear reflector on motorcycle missing |1.4.1| | 83 |
| Rear reflector missing (4.8.2 (a) (ii)) | 31 |
| Horn not working (7.7 (a)) | 23 |
| Horn not working |1.7.3a| | 17 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Registration plate lamp issues | 16 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 14 |
| Rear reflector missing |4.8.2 |a| |ii|| | 14 |
| Headlamp aim beam image kick up to the offside |1.6| | 13 |
| Drive chain excessively loose |6.2.1d| | 12 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Rear Footrest missing |6.2.1a| | 10 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 10 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 10 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 10 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Stop lamp remains on when the brakes are released | 7 |
| Nearside Rear Footrest missing |6.2.1a| | 7 |
| Offside Rear Footrest missing |6.2.1a| | 7 |
| Rear Brake excessively binding (1.2.1 (f)) | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 6 |
| All direction indicators not working (4.4.1 (a) (ii)) | 6 |
| Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Rear Footrest missing (6.2.12 (a)) | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Direction indicators not working |1.5.1c| | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 5 |
| 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| | 5 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 5 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 4 |
| Rear Shock absorber has negligible damping effect (5.3.2 (b)) | 4 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 4 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Headlamp aim unable to be tested (4.1.2 (b)) | 4 |
| Front Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Nearside Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 3 |
| Offside Front Footrest insecure |6.2.1a| | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Rear Footrest missing |6.2.12 |a|| | 3 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |