| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 184 |
| Registration plate lamp issues | 136 |
| Registration plate issues | 80 |
| Drive chain excessively loose |6.2.1d| | 52 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 52 |
| Rear reflector on motorcycle missing |1.4.1| | 52 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 20 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 20 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 17 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Horn not working |1.7.3a| | 15 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 14 |
| Rear reflector missing (4.8.2 (a) (ii)) | 14 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Drive chain excessively tight |6.2.1d| | 12 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 12 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 12 |
| Rear Position lamp not working (4.2.1 (a)) | 11 |
| Throttle operating incorrectly |6.2.1f| | 11 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 11 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 11 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Drive chain worn to excess |6.2.1e| | 10 |
| Rear Footrest missing |6.2.1a| | 9 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 9 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 9 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 9 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 8 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Front Brake excessively binding (1.2.1 (f)) | 8 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 8 |
| Rear Position lamp not working |4.2.1 |a|| | 7 |
| Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 7 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 7 |
| Nearside Rear Footrest missing |6.2.1a| | 6 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 6 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 6 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 6 |
| Rear Drive chain excessively loose |6.2.1d| | 6 |
| Offside Rear Footrest missing |6.2.1a| | 5 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 5 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Drive chain excessively tight |6.1.7 |k| |i|| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Rear Brake disc significantly and obviously worn (1.1.14 (a) (i)) | 4 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Rear Brake indicates excessive fluctuation of brake effort |1.2.1 |e|| | 4 |
| Handlebar deformed |2.1.1b| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Fuel tank insecure (6.1.3 (a) (i)) | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| 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| | 4 |