| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 43 |
| Rear reflector on motorcycle missing |1.4.1| | 33 |
| Registration plate issues | 24 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 17 |
| Stop lamp remains on when the brake is released |1.3.1e| | 16 |
| 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 |
| 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 position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Drive chain excessively loose |6.2.1d| | 8 |
| Horn not working |1.7.3a| | 7 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 6 |
| Headlamp aim beam image kick up to the offside |1.6| | 6 |
| Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Stop lamp remains on when the brakes are released | 5 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Drive chain worn to excess |6.2.1e| | 5 |
| Horn not working (7.7 (a) (ii)) | 5 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 5 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 5 |
| Rear Position lamp not working (4.2.1 (a)) | 5 |
| Registration plate lamp issues | 5 |
| Horn not working (7.7 (a)) | 4 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 4 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 4 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 4 |
| Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Horn not working |7.7 |a| |ii|| | 3 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 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 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 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 at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 3 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Parking brake: efficiency below requirements |3.7.C.1b| | 2 |
| Front Brake excessively binding (1.2.1 (f)) | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Handlebar mounting clamp loose |2.1.1a| | 2 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Front Wheel bearing has excessive play (5.1.3 (a) (i)) | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Rear reflector missing |4.8.2 |a| |ii|| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Front Brake disc|s| cracked |3.2.A1g| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Headlamp insecure |1.2.3b| | 2 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Rear Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Front Headlamp insecure |1.2.3b| | 2 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Front suspension has inadequate damping effect. |2.3.6c| | 2 |