| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 308 |
| Registration plate issues | 140 |
| Horn not working |1.7.3a| | 87 |
| Rear reflector on motorcycle missing |1.4.1| | 60 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 45 |
| Registration plate lamp issues | 45 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 29 |
| Rear reflector missing (4.8.2 (a) (ii)) | 26 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Drive chain excessively loose |6.2.1d| | 21 |
| Horn not working (7.7 (a) (ii)) | 18 |
| Horn not working |7.7 |a| |ii|| | 18 |
| Horn not working (7.7 (a)) | 17 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 17 |
| Front wheel bearings have excessive free play |2.3.5b| | 17 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| 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| | 11 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 10 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Headlamp aim beam image kick up to the offside |1.6| | 10 |
| Rear Footrest missing |6.2.1a| | 10 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 9 |
| Throttle operating incorrectly |6.2.1f| | 9 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 8 |
| Drive chain excessively tight |6.2.1d| | 7 |
| Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Front Horn not working |1.7.3a| | 7 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 6 |
| Nearside Rear Footrest missing |6.2.1a| | 6 |
| Offside Rear Footrest missing |6.2.1a| | 6 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 6 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 6 |
| Offside Front Footrest insecure |6.2.1a| | 6 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Front Brake excessively binding |1.2.1 |f|| | 5 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 5 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Nearside Headlamp aim beam image kick up to the offside |1.6| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Drive chain worn to excess |6.2.1e| | 5 |
| Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 5 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 5 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Offside Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 4 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 4 |
| Front Brake excessively binding (1.2.1 (f)) | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 4 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition |8.1.1 |a|| | 4 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 4 |
| Offside Front Direction indicators not working |1.5.1c| | 4 |