| Most common failures | No# failures |
|---|
| Registration plate issues | 636 |
| Headlamp aim out of alignment | 571 |
| Rear reflector on motorcycle missing |1.4.1| | 511 |
| Horn not working |1.7.3a| | 236 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 209 |
| Headlamp aim beam image kick up to the offside |1.6| | 121 |
| Drive chain excessively loose |6.2.1d| | 115 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 103 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 97 |
| 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| | 92 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 90 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 86 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 84 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 76 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 75 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 61 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 60 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 57 |
| Drive chain excessively tight |6.2.1d| | 55 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 55 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 52 |
| Offside Front Footrest insecure |6.2.1a| | 51 |
| Rear reflector missing (4.8.2 (a) (ii)) | 50 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 49 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 44 |
| Registration plate lamp issues | 44 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 43 |
| Drive chain worn to excess |6.2.1e| | 43 |
| Offside Front Direction indicator not working |1.5.1c| | 42 |
| Horn not working (7.7 (a) (ii)) | 34 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 33 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 33 |
| Nearside Rear Direction indicator not working |1.5.1c| | 32 |
| Offside Rear Direction indicator not working |1.5.1c| | 31 |
| Nearside Front Direction indicator not working |1.5.1c| | 31 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 30 |
| Nearside Front Direction indicators not working |1.5.1c| | 29 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Offside Front Direction indicators not working |1.5.1c| | 25 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 25 |
| Rear reflector missing |4.8.2 |a| |ii|| | 24 |
| Nearside Front Footrest insecure |6.2.1a| | 24 |
| Front wheel bearings have excessive free play |2.3.5b| | 23 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 23 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 23 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 23 |
| Front position lamp incorrect colour |1.1.2a| | 23 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 22 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 22 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 22 |
| Nearside Rear Direction indicators not working |1.5.1c| | 22 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 20 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 20 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 19 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 19 |
| Front Position lamp not working (4.2.1 (a)) | 19 |
| Steering headbearing has excessive free play |2.2.2| | 19 |
| Front Horn not working |1.7.3a| | 18 |
| Rear Direction indicator flashing more than 120 times per minute |1.5.1c| | 18 |
| Throttle operating incorrectly |6.2.1f| | 17 |
| Offside Footrest insecure |6.2.1a| | 17 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 17 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Offside Rear Direction indicators not working |1.5.1c| | 17 |
| Riders seat insecure |6.2.1a| | 16 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 16 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 16 |
| Stop lamp remains on when the brake is released |1.3.1e| | 15 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 15 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 15 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 15 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 15 |
| Horn not working |7.7 |a| |ii|| | 15 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 15 |
| Nearside Footrest insecure |6.2.1a| | 15 |
| Rear Direction indicator incorrect colour |1.5.1b| | 14 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 14 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 14 |
| Stop lamp remains on when the brakes are released | 14 |
| Rear Drive chain excessively loose |6.2.1d| | 14 |
| Front wheel bearings are excessively rough |2.3.5b| | 14 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 13 |
| Rear Position lamp not working (4.2.1 (a)) | 13 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 13 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 13 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 13 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 13 |
| Front Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 12 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 12 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 12 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 12 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 12 |
| Horn not working (7.7 (a)) | 12 |