| Most common failures | No# failures |
|---|
| Registration plate issues | 122 |
| Rear reflector on motorcycle missing |1.4.1| | 83 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 31 |
| Front wheel bearings have excessive free play |2.3.5b| | 31 |
| Headlamp aim out of alignment | 28 |
| Horn not working |1.7.3a| | 24 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 22 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 21 |
| Horn missing |1.7.1| | 19 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 17 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 13 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 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| | 11 |
| Rear reflector missing (4.8.2 (a) (ii)) | 9 |
| Horn not working (7.7 (a)) | 8 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Front wheel bearings are excessively rough |2.3.5b| | 8 |
| Rear Wheel spoke excessively loose |4.2.1b| | 8 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 5 |
| Drive chain worn to excess |6.2.1e| | 5 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 5 |
| Drive chain excessively loose |6.2.1d| | 5 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Rear reflector missing |4.8.2 |a| |ii|| | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Horn not working (7.7 (a) (ii)) | 4 |
| Fuel system component leaking |7.2.1a| | 4 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| Headlamp aim not tested (4.1.2 (b)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Steering headbearing has excessive free play |2.2.2| | 3 |
| Registration plate lamp issues | 3 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 3 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 3 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Rear suspension component seized |2.4A2a|ii|| | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Rear Brake disc|s| has excessive run out |3.2.A1m| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Stop lamp not working (4.3.1 (a) (ii)) | 2 |
| Dipswitch does not extinquish main beam/s, leaving at least 1 dipped beam headlamp |1.2.2b|i|| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Centre Rear Rear reflector on motorcycle missing |1.4.1| | 2 |
| Rear Wheel spoke missing |4.2.1b| | 2 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 2 |
| Front Stop lamp missing |1.3.3a| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |
| Position lamp switch does not operate the front and rear position lamps |1.1.4c| | 2 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Brake performance not tested |3.3| | 2 |
| Rear mono-shock pivot excessively worn |2.4.B.4| | 2 |
| Front Wheel spoke excessively loose |4.2.1b| | 2 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Front Wheel bearing play so excessive it is likely to break up (5.1.3 (a) (ii)) | 2 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |