| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 153 |
| Registration plate lamp issues | 88 |
| Registration plate issues | 65 |
| Rear reflector on motorcycle missing |1.4.1| | 57 |
| Steering headbearing has excessive free play |2.2.2| | 54 |
| Drive chain excessively loose |6.2.1d| | 50 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 38 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Horn not working |1.7.3a| | 30 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 30 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 25 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 24 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 16 |
| Rear reflector missing (4.8.2 (a) (ii)) | 15 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 15 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 14 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 14 |
| Drive chain worn to excess |6.2.1e| | 11 |
| Drive chain excessively tight |6.2.1d| | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 9 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 9 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 8 |
| Handlebar deformed |2.1.1b| | 8 |
| Throttle operating incorrectly |6.2.1f| | 8 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 8 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 7 |
| Front Brake excessively binding (1.2.1 (f)) | 7 |
| Rear Position lamp not working (4.2.1 (a)) | 7 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 6 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 6 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 6 |
| Front Steering headbearing has excessive free play |2.2.2| | 6 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 6 |
| 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| | 5 |
| Offside Front Direction indicator insecure |1.5.3b| | 5 |
| Headlamp aim beam image kick up to the offside |1.6| | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 5 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 5 |
| Rear Position lamp not working |4.2.1 |a|| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Front Position lamp not working (4.2.1 (a)) | 5 |
| Front Position lamp not working |4.2.1 |a|| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Riders seat insecure (6.2.5 (a) (ii)) | 4 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Rear reflector missing |4.8.2 |a| |ii|| | 4 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |