| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 389 |
| Registration plate issues | 117 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 56 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 54 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 52 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 42 |
| Rear reflector on motorcycle missing |1.4.1| | 35 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Drive chain excessively loose |6.2.1d| | 26 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 22 |
| Horn not working |1.7.3a| | 22 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 22 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 21 |
| Rear reflector missing (4.8.2 (a) (ii)) | 21 |
| 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| | 18 |
| Rear Brake excessively binding (1.2.1 (f)) | 18 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 15 |
| Registration plate lamp issues | 13 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 12 |
| Stop lamp remains on when the brake is released |1.3.1e| | 12 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 12 |
| Throttle operating incorrectly |6.2.1f| | 12 |
| Rear Position lamp not working (4.2.1 (a)) | 12 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 11 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 11 |
| Headlamp insecure |1.2.3b| | 10 |
| Nearside Front Direction indicator not working |1.5.1c| | 10 |
| Riders seat insecure |6.2.1a| | 9 |
| Rear reflector missing |4.8.2 |a| |ii|| | 8 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Offside Rear Footrest missing |6.2.1a| | 7 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Drive chain worn to excess |6.2.1e| | 7 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 7 |
| Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Offside Front Footrest insecure |6.2.1a| | 6 |
| Rear Wheel spoke cracked. |4.2.1b| | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Headlamp insecure (4.1.1 (c)) | 6 |
| Direction indicators not working |1.5.1c| | 5 |
| Rear Exhaust markings indicating not for road use or similar wording |7.1.4| | 5 |
| Rear Brake excessively binding |1.2.1 |f|| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 5 |
| Rear Brake disc|s| cracked |3.2.A1g| | 5 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Offside Front Direction indicator not working |1.5.1c| | 5 |
| Stop lamp remains on when the brakes are released | 5 |
| Rear Wheel spoke excessively loose |4.2.1b| | 5 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 5 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Front Brake excessively binding (1.2.1 (f)) | 5 |