| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 93 |
| Registration plate issues | 89 |
| Rear reflector on motorcycle missing |1.4.1| | 38 |
| Registration plate lamp issues | 36 |
| Windscreen wiper does not clear the windscreen effectively | 32 |
| Horn not working |1.7.3a| | 21 |
| Drive chain excessively loose |6.2.1d| | 19 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 16 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Rear reflector missing (4.8.2 (a) (ii)) | 16 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 15 |
| Nearside Front position lamp|s| not working |1.1.A.3b| | 13 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Horn missing |1.7.1| | 13 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 12 |
| Brake pipe excessively corroded | 11 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 11 |
| Offside Front position lamp|s| not working |1.1.A.3b| | 10 |
| Drive chain worn to excess |6.2.1e| | 10 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Nearside Headlamp aim beam image kick up to the offside |1.8| | 9 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 9 |
| Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Nearside Stop lamp not working |1.2.1b| | 9 |
| Steering headbearing has excessive free play |2.2.2| | 9 |
| Offside Headlamp aim beam image kick up to the offside |1.8| | 8 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 8 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 8 |
| Drive chain excessively tight |6.2.1d| | 7 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 7 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 7 |
| Offside Rear fog lamp missing |1.3.2a| | 6 |
| Anti-lock braking system warning lamp indicates an ABS fault | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 6 |
| Nearside Rear Stop lamp not working |1.2.1b| | 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| | 6 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 6 |
| Offside Rear Stop lamp not working |1.2.1b| | 6 |
| Offside Stop lamp not working |1.2.1b| | 6 |
| Front Steering headbearing has excessive free play |2.2.2| | 5 |
| Rear fog lamp switch missing |1.3.1a| | 5 |
| Offside Headlamp not working on dipped beam |1.7.5a| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Parking brake: efficiency below requirements |3.7.B.7| | 5 |
| Offside Front Anti-roll bar linkage insecure |2.4.G.1| | 5 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Offside Rear fog lamp not working |1.3.2b| | 4 |
| Nearside Side repeater missing |1.4.A.2b| | 4 |
| Offside Side repeater missing |1.4.A.2b| | 4 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 4 |
| Nearside Front position lamp|s| incorrect colour |1.1.A.3e| | 4 |
| Offside Front position lamp|s| incorrect colour |1.1.A.3e| | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Front position lamp|s| not working |1.1.A.3b| | 4 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 4 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Handlebar deformed |2.1.1b| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Exhaust emissions Lambda reading after 2nd fast idle outside specified limits |7.3.D.3| | 3 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Rear 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| | 3 |
| Nearside Front Front position lamp|s| incorrect colour |1.1.A.3e| | 3 |
| Offside Front Front position lamp|s| incorrect colour |1.1.A.3e| | 3 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 3 |
| Rear fog lamp not working |1.3.2b| | 3 |
| Supplementary Restraint System warning lamp indicates a fault |5.4.2| | 3 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 3 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 3 |
| Front Wheel spoke excessively loose |4.2.1b| | 3 |
| Parking brake: efficiency below requirements |3.7.C.1b| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Front Headlamp aim beam image kick up to the offside |1.8| | 3 |
| Windscreen has a sticker or other obstruction encroaching into the swept area by more than 40mm outside zone `A` |8.3.1e| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 3 |
| Nearside Front Headlamp not working on dipped beam |1.7.5a| | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Offside Front Anti-roll bar linkage fractured |2.4.G.1| | 3 |
| Brakes imbalanced across an axle | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Engine MIL inoperative or indicates a malfunction (8.2.1.2 (h)) | 3 |
| Nearside Front Position lamp not working (4.2.1 (a) (ii)) | 3 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |