| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 223 |
| Registration plate issues | 97 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 79 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 50 |
| Offside Rear Direction indicator not working |1.5.1c| | 48 |
| Offside Rear Direction indicators not working |1.5.1c| | 41 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 39 |
| Nearside Rear Direction indicator not working |1.5.1c| | 39 |
| Horn not working |1.7.3a| | 38 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 33 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 28 |
| Steering headbearing has excessive free play |2.2.2| | 27 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Nearside Rear Direction indicators not working |1.5.1c| | 26 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 26 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 24 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 23 |
| Nearside Front Direction indicator not working |1.5.1c| | 19 |
| Front wheel bearings have excessive free play |2.3.5b| | 19 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 18 |
| Headlamp insecure |1.2.3b| | 18 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 16 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 16 |
| Stop lamp remains on when the brake is released |1.3.1e| | 16 |
| Riders seat insecure |6.2.1a| | 16 |
| Rear reflector on motorcycle missing |1.4.1| | 15 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 14 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 13 |
| Nearside Front Direction indicators not working |1.5.1c| | 13 |
| Direction indicators not working |1.5.1c| | 12 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 11 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 11 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 11 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 10 |
| Offside Front Direction indicator not working |1.5.1c| | 10 |
| Throttle operating incorrectly |6.2.1f| | 9 |
| Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 9 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 9 |
| Offside Rear Direction indicator incorrect colour |1.5.1b| | 9 |
| Headlamp aim not tested |1.6| | 8 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 8 |
| Brake lever cannot be applied smoothly |3.1.3d| | 8 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Front Steering headbearing has excessive free play |2.2.2| | 8 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 8 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Stop lamp remains on when the brakes are released | 7 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 7 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 7 |
| Offside Front Direction indicators not working |1.5.1c| | 7 |
| Rear wheel has a missing wheel nut|s| |4.2.3a| | 7 |
| Offside Front Direction indicator incorrect colour |1.5.1b| | 7 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 7 |
| 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| | 6 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 6 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 6 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 6 |
| Nearside Rear Direction indicator not working |4.4.1 |a| |ii|| | 6 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 6 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Nearside Steering lock stop ineffective |2.1.3| | 5 |
| Rear wheel insecure |4.2.3b| | 5 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 5 |
| Rear Position lamp not working |4.2.1 |a|| | 5 |
| Rear Direction indicator incorrect colour |1.5.1b| | 5 |
| Front Position lamp not working |4.2.1 |a|| | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 5 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 5 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 5 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 5 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 5 |
| Front Horn not loud enough to be heard by another road user |1.7.3a| | 5 |
| Nearside Front Direction indicator incorrect colour |1.5.1b| | 5 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Horn not working |7.7 |a| |ii|| | 4 |
| Front Direction indicator not working |1.5.1c| | 4 |
| Indicator tell tale not functioning |1.5.2| | 4 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Front Direction indicator incorrect colour |1.5.1b| | 4 |
| Rear wheel spindle loose |2.4.A.2b| | 4 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 4 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| Front Horn not working |1.7.3a| | 4 |
| Front Brake hose leaking fluid |3.2.B4| | 4 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 4 |
| Direction indicator incorrect colour |1.5.1b| | 4 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Horn is not a constant note |1.7.3c| | 4 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 4 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 4 |
| Nearside Indicator tell tale not functioning |1.5.2| | 4 |