| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 163 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 48 |
| Drive chain excessively loose |6.2.1d| | 44 |
| Registration plate issues | 29 |
| Registration plate lamp issues | 29 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 28 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 21 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 21 |
| Horn not working |1.7.3a| | 21 |
| Drive chain worn to excess |6.2.1e| | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Offside Rear Footrest missing |6.2.1a| | 11 |
| Throttle operating incorrectly |6.2.1f| | 10 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 9 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 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| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 7 |
| Nearside Front Footrest insecure |6.2.1a| | 7 |
| Rear reflector on motorcycle missing |1.4.1| | 7 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 7 |
| Rear Brake excessively binding (1.2.1 (f)) | 6 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Rear Drive chain excessively loose |6.2.1d| | 6 |
| Offside Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 6 |
| Exhaust excessively deteriorated |7.1.1a| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Offside Front Footrest insecure |6.2.1a| | 6 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 5 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 4 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Headlamp aim so that beam "kick up" is not visible on the screen (4.1.2 (a)) | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Rear Valve stem seriously damaged |5.2.3 |j|| | 3 |
| Rear Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 3 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Rear Drive chain excessively tight |6.2.1d| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 3 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 3 |
| Front Brake excessively binding (1.2.1 (f)) | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Handlebar deformed |2.1.1b| | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |
| Nearside Rear Direction indicator not working |1.5.1c| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Stop lamp remains on when the brakes are released | 3 |