| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 135 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 55 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 50 |
| Registration plate issues | 47 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 41 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 36 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 35 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 31 |
| Riders seat insecure |6.2.1a| | 29 |
| Rear reflector on motorcycle missing |1.4.1| | 29 |
| Steering headbearing has excessive free play |2.2.2| | 25 |
| Horn not working |1.7.3a| | 23 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 21 |
| Front wheel bearings have excessive free play |2.3.5b| | 18 |
| Headlamp insecure |1.2.3b| | 18 |
| Fuel cap sealing washer missing |7.2.2c| | 17 |
| Exhaust excessively deteriorated |7.1.1a| | 13 |
| Headlamp aim beam image kick up to the offside |1.6| | 12 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 10 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Front wheel bearings are excessively rough |2.3.5b| | 9 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 8 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 8 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 8 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 7 |
| Offside Rear Direction indicators not working |1.5.1c| | 7 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 7 |
| Brake hose damaged | 7 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Brake lever has inadequate reserve travel |3.1.3b| | 6 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 6 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 6 |
| Horn control defective |1.7.2a| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Rear suspension bush excessively deteriorated |2.4.A2a|i|| | 5 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 5 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 5 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Headlamp aim not tested |1.6| | 5 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Registration plate lamp issues | 5 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Horn sounds harsh or grating |1.7.3c| | 4 |
| 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| | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Nearside Rear Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Exhaust has a major leak of exhaust gases (6.1.2 (a)) | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 3 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Offside Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Offside Steering lock stop ineffective |2.1.3| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 3 |
| Offside Rear Footrest insecure |6.2.1a| | 3 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 3 |
| Handlebar mounting clamp loose |2.1.1a| | 3 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |