| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 390 |
| Registration plate issues | 156 |
| Registration plate lamp issues | 142 |
| Headlamp aim beam image kick up to the offside |1.6| | 96 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 81 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 79 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 70 |
| Drive chain excessively loose |6.2.1d| | 65 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 65 |
| Rear reflector on motorcycle missing |1.4.1| | 62 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 62 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 58 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 55 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 52 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 42 |
| Throttle operating incorrectly |6.2.1f| | 36 |
| Drive chain worn to excess |6.2.1e| | 31 |
| Front Brake excessively binding (1.2.1 (f)) | 31 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 30 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 29 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 28 |
| Horn not working |1.7.3a| | 27 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 27 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 26 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 25 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 25 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 25 |
| Drive chain excessively tight |6.2.1d| | 24 |
| Steering headbearing has excessive free play |2.2.2| | 23 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 23 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 22 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 21 |
| Rear Position lamp not working (4.2.1 (a)) | 20 |
| Front wheel bearings have excessive free play |2.3.5b| | 19 |
| Stop lamp remains on when the brakes are released | 19 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 17 |
| Rear Brake excessively binding (1.2.1 (f)) | 16 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 15 |
| Exhaust has part of the system missing |7.1.1a| | 15 |
| Stop lamp remains on when the brake is released |1.3.1e| | 15 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 14 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 14 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 13 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 13 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 12 |
| 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| | 12 |
| Rear Floor brake test indicates a binding brake |3.3.C2c| | 12 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% |1.2.2 |a| |i|| | 12 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 12 |
| Rear reflector missing (4.8.2 (a) (ii)) | 12 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 12 |
| Front position lamp incorrect colour |1.1.2a| | 11 |
| Nearside Front Direction indicator not working |1.5.1c| | 11 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 11 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Rear Brake disc|s| cracked |3.2.A1g| | 10 |
| Nearside Headlamp aim beam image kick up to the offside |1.6| | 10 |
| Offside Headlamp aim beam image kick up to the offside |1.6| | 10 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 10 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 9 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Rear Drive chain excessively loose |6.2.1d| | 9 |
| Nearside Front Direction indicators not working |1.5.1c| | 9 |
| Direction indicators not working |1.5.1c| | 9 |
| Front Brake excessively binding |1.2.1 |f|| | 8 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 8 |
| Nearside Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 8 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 8 |