| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 81 |
| Registration plate issues | 71 |
| Headlamp aim out of alignment | 58 |
| Horn not working |1.7.3a| | 21 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Rear reflector missing (4.8.2 (a) (ii)) | 12 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Rear reflector missing |4.8.2 |a| |ii|| | 9 |
| Drive chain worn to excess |6.2.1e| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 8 |
| Drive chain excessively loose |6.2.1d| | 8 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| 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| | 7 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 6 |
| Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 6 |
| Offside Rear Direction indicators not working |1.5.1c| | 5 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Drive chain excessively tight |6.2.1d| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Horn not working (7.7 (a)) | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Throttle operating incorrectly |6.2.1f| | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Offside Rear Direction indicator not working |4.4.1 |a| |ii|| | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Brake hose damaged | 3 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Nearside Rear Footrest missing |6.2.12 |a|| | 3 |
| Rear Wheel spoke excessively loose |4.2.1b| | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Front Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Rear Brake caliper|s| securing bolt|s| loose |3.2.A1j| | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Rear Direction indicators not working |1.5.1c| | 2 |
| Offside Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Direction indicator missing |1.5.1a| | 2 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 2 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Front Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |