| Most common failures | No# failures |
|---|
| Registration plate issues | 426 |
| Headlamp aim out of alignment | 335 |
| Rear reflector on motorcycle missing |1.4.1| | 332 |
| Horn not working |1.7.3a| | 142 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 105 |
| 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| | 74 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 67 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 65 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 51 |
| Headlamp aim beam image kick up to the offside |1.6| | 49 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 45 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 44 |
| Rear reflector missing (4.8.2 (a) (ii)) | 40 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 37 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 35 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 34 |
| Rear reflector missing |4.8.2 |a| |ii|| | 29 |
| Registration plate lamp issues | 29 |
| Drive chain excessively tight |6.2.1d| | 29 |
| Drive chain excessively loose |6.2.1d| | 27 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 25 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 24 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 24 |
| Nearside Rear Direction indicators not working |1.5.1c| | 24 |
| Nearside Rear Direction indicator not working |1.5.1c| | 23 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 23 |
| Offside Front Footrest insecure |6.2.1a| | 23 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 23 |
| Offside Rear Direction indicator not working |1.5.1c| | 22 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 21 |
| Nearside Front Direction indicator not working |1.5.1c| | 19 |
| Nearside Front Footrest insecure |6.2.1a| | 18 |
| Front position lamp incorrect colour |1.1.2a| | 18 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 17 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 17 |
| Offside Front Direction indicator not working |1.5.1c| | 16 |
| Offside Rear Direction indicators not working |1.5.1c| | 16 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 16 |
| Front wheel bearings have excessive free play |2.3.5b| | 14 |
| Nearside Front Direction indicators not working |1.5.1c| | 14 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 13 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Front Horn not working |1.7.3a| | 13 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 12 |
| Offside Front Direction indicators not working |1.5.1c| | 12 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 12 |
| Front Position lamp not working (4.2.1 (a)) | 11 |
| Horn not working (7.7 (a) (ii)) | 11 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 11 |
| Nearside Footrest insecure |6.2.1a| | 11 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 10 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 10 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 10 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Rear 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| | 9 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 9 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 9 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Headlamp incorrect colour |1.2.1| | 9 |
| Stop lamp remains on when the brake is released |1.3.1e| | 9 |
| Front Position lamp not working |4.2.1 |a|| | 8 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 8 |
| Horn not working (7.7 (a)) | 8 |
| Steering headbearing has excessive free play |2.2.2| | 8 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 8 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 8 |