| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 247 |
| Registration plate lamp issues | 139 |
| Registration plate issues | 92 |
| Drive chain excessively loose |6.2.1d| | 72 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 70 |
| Rear reflector on motorcycle missing |1.4.1| | 66 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 29 |
| Rear reflector missing (4.8.2 (a) (ii)) | 28 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 22 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 21 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 20 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 20 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 19 |
| Horn not working |1.7.3a| | 18 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 18 |
| Steering headbearing has excessive free play |2.2.2| | 17 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 16 |
| Throttle operating incorrectly |6.2.1f| | 16 |
| Drive chain excessively tight |6.2.1d| | 13 |
| Drive chain worn to excess |6.2.1e| | 12 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 12 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 12 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Rear Position lamp not working (4.2.1 (a)) | 11 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 11 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 11 |
| Handlebar deformed |2.1.1b| | 10 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 10 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 10 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 9 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 9 |
| Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 9 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 9 |
| Front Brake excessively binding (1.2.1 (f)) | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Horn not working |7.7 |a| |ii|| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 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| | 7 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 7 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 6 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Stop lamp remains on when the brakes are released | 6 |
| Headlamp aim not tested (4.1.2 (b)) | 6 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 6 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 5 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |