| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 320 |
| Registration plate issues | 80 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 66 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 57 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 51 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 50 |
| Drive chain excessively loose |6.2.1d| | 33 |
| Rear reflector on motorcycle missing |1.4.1| | 32 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 22 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Horn not working |1.7.3a| | 20 |
| Throttle operating incorrectly |6.2.1f| | 20 |
| Rear reflector missing (4.8.2 (a) (ii)) | 20 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 18 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 16 |
| Rear Brake excessively binding (1.2.1 (f)) | 16 |
| 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| | 15 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 14 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 13 |
| Headlamp insecure |1.2.3b| | 13 |
| Drive chain worn to excess |6.2.1e| | 11 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 11 |
| Rear Brake excessively binding |1.2.1 |f|| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 9 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 9 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 9 |
| Front Brake excessively binding (1.2.1 (f)) | 9 |
| Registration plate lamp issues | 8 |
| Rear Wheel spoke cracked. |4.2.1b| | 8 |
| Rear Wheel spoke excessively loose |4.2.1b| | 8 |
| Rear Position lamp not working (4.2.1 (a)) | 8 |
| Rear Wheel spoke missing |4.2.1b| | 7 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 7 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Rear reflector missing |4.8.2 |a| |ii|| | 6 |
| Stop lamp remains on when the brakes are released | 6 |
| Riders seat insecure |6.2.1a| | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 5 |
| Offside Front Direction indicator not working |1.5.1c| | 5 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 5 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Front Brake disc|s| is excessively distorted |3.2.A1m| | 4 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 4 |
| Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Front Horn not working |1.7.3a| | 4 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Front Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 4 |
| Horn not working (7.7 (a)) | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |