| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 137 |
| Registration plate issues | 83 |
| Rear reflector on motorcycle missing |1.4.1| | 62 |
| Windscreen wiper does not clear the windscreen effectively | 46 |
| Registration plate lamp issues | 30 |
| Headlamp aim beam image kick up to the offside |1.6| | 29 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 24 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Parking brake: efficiency below requirements |3.7.B.7| | 23 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 16 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 15 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 15 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 14 |
| Drive chain excessively loose |6.2.1d| | 14 |
| Nearside Front position lamp|s| not working |1.1.A.3b| | 14 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 13 |
| Offside Front position lamp|s| not working |1.1.A.3b| | 13 |
| Nearside Stop lamp not working |1.2.1b| | 13 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Rear parking brake recording little or no effort | 13 |
| Horn not working |1.7.3a| | 12 |
| Exhaust emissions carbon monoxide content after 2nd fast idle excessive |7.3.D.3| | 11 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| Steering headbearing has excessive free play |2.2.2| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 10 |
| Drive chain worn to excess |6.2.1e| | 10 |
| Brake pipe excessively corroded | 10 |
| Offside Rear fog lamp not working |1.3.2b| | 9 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 8 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 8 |
| Nearside Rear Stop lamp not working |1.2.1b| | 8 |
| 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 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 7 |
| Rear Wheel spoke excessively loose |4.2.1b| | 7 |
| Windscreen has a sticker or other obstruction encroaching into the swept area by more than 40mm outside zone `A` |8.3.1e| | 6 |
| Front Headlamp aim beam image kick-up is to the offside |1.6.1| | 6 |
| Throttle operating incorrectly |6.2.1f| | 6 |
| Offside Stop lamp not working |1.2.1b| | 6 |
| Front wheel bearings are excessively rough |2.3.5b| | 6 |
| Offside Front Direction indicator not working |1.5.1c| | 6 |
| Exhaust emissions carbon monoxide content at idle excessive |7.3.D.4| | 6 |
| Nearside Front Front position lamp|s| not working |1.1.A.3b| | 6 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Offside Front Front position lamp|s| not working |1.1.A.3b| | 5 |
| Rear Rear fog lamp not working |1.3.2b| | 5 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Horn missing |1.7.1| | 5 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 5 |
| Rear Drive chain worn to excess |6.2.1e| | 5 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Offside Rear Direction indicator not working |1.5.1c| | 5 |
| Parking brake lever has no reserve travel |3.1.6b| | 5 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Brakes imbalanced across an axle | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Offside Headlamp not in good working order adversely affecting beam image |1.2.4a| | 5 |
| Offside Steering rack gaiter split |2.2.D.2d| | 5 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Drive chain excessively tight |6.2.1d| | 4 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 4 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Offside Front Suspension arm rubber bush deteriorated resulting in excessive movement |2.4.G.2| | 4 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Exhaust emissions Lambda reading after 2nd fast idle outside specified limits |7.3.D.3| | 4 |
| Rear Exhaust has a major leak of exhaust gases |7.1.2| | 4 |
| Nearside Front Shock absorber has a serious fluid leak |2.7.3| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Nearside Front Headlamp aim beam image kick up to the offside |1.8| | 4 |
| Offside Front Headlamp aim beam image kick up to the offside |1.8| | 4 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Rear Drive chain excessively loose |6.2.1d| | 4 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 4 |
| Front brake disc in such a condition that it is seriously weakened | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Nearside Front Position lamp not working (4.2.1 (a) (ii)) | 4 |
| Rear reflector missing (4.8.2 (a) (ii)) | 4 |
| Rear fog lamp missing |1.3.2a| | 3 |
| Rear brake binding | 3 |
| Rear fog lamp not working |1.3.2b| | 3 |
| Headlamp aim beam image kick up to the offside |1.8| | 3 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 3 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Nearside Front Headlamp not working on dipped beam |1.7.5a| | 3 |
| Direction indicators not working |1.5.1c| | 3 |
| Nearside Rear Shock absorber has a serious fluid leak |2.7.3| | 3 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 3 |
| Front Steering headbearing has excessive free play |2.2.2| | 3 |
| Nearside Headlamp not working on dipped beam |1.7.5a| | 3 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Offside Rear fog lamp missing |1.3.2a| | 3 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 3 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 3 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 3 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Front Headlamp aim beam image kick up to the offside |1.8| | 3 |
| Nearside Front Anti-roll bar linkage fractured |2.4.G.1| | 3 |
| Headlamp aim beam image kick-up is to the offside |1.6.1| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Offside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 3 |
| Nearside Front position lamp|s| incorrect colour |1.1.A.3e| | 3 |
| Offside Front position lamp|s| incorrect colour |1.1.A.3e| | 3 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 3 |
| Riders seat insecure |6.2.1a| | 3 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 3 |
| Rear Footrest missing |6.2.1a| | 3 |
| Rear position lamp insecure |1.1.1c| | 3 |
| Supplementary Restraint System warning lamp indicates a fault |5.4.2| | 3 |
| Offside Rear Stop lamp not working |1.2.1b| | 3 |
| Exhaust emissions hydrocarbon content after 2nd fast idle excessive |7.3.D.3| | 3 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Offside Rear Anti-roll bar linkage has excessive play in a ball joint |2.4.G.2| | 3 |
| Service brake: efficiency below requirements |3.7.B.7| | 3 |
| Offside Rear Direction indicator incorrect colour |1.4.A.2f| | 3 |
| Nearside front brake binding |3.7.B.1| | 3 |
| Emissions not tested |7.0| | 3 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| An item not tested |Manual| | 3 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Front Horn not working |1.7.3a| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear position lamp does not illuminate immediately when it is switched on (1.1.3a) | 3 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 3 |
| 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)) | 3 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 3 |