| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Registration plate issues | 3 |
| Front wheel spindle securing nut locking device missing |2.3.3a| | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 2 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 2 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Offside Rear Direction indicator not working |1.5.1c| | 2 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Rear reflector on motorcycle missing |1.4.1| | 2 |
| Nearside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Offside Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 2 |
| Throttle operating incorrectly sticking |6.2.1f| | 1 |
| Drive chain so worn it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Offside Front Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Centre Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Brake locking device missing |3.2.A1e| | 1 |
| Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 1 |
| Rear Brake pedal insecure |3.1.2a| | 1 |
| Front Brake disc|s| insecure |3.2.A1g| | 1 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 1 |
| Nearside Rear Footrest insecure |6.2.1a| | 1 |
| Offside Rear Footrest insecure |6.2.1a| | 1 |
| Front Front wheel spindle securing nut locking device missing |2.3.3a| | 1 |
| Brake hose damaged | 1 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 1 |
| Brake pedal insecure |3.1.2a| | 1 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 1 |
| Drive chain excessively loose |6.2.1d| | 1 |
| Drive chain sprocket worn to excess insecure. and carrier insecure. |6.2.1e| | 1 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 1 |
| Front Direction indicator affected by the operation of another lamp |1.5.1c| | 1 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Centre Rear Rear reflector on motorcycle insecure |1.4.2c| | 1 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Rear Locking device(s) not correctly fitted which may make the motor bicycle dangerous to ride (6.2.1h) | 1 |
| Headlamp aim beam image kick up to the offside (1.6) | 1 |
| Brake pipe excessively corroded | 1 |
| Rear Brake master cylinder severely damaged |3.2.B1b| | 1 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 1 |
| Direction indicators not working |1.5.1c| | 1 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Fuel hose leaking |7.2.1a| | 1 |
| Offside Footrest insecure |6.2.1a| | 1 |
| Front Brake cylinder leaking hydraulic fluid |3.2.B1e| | 1 |
| Offside Front Upper Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 1 |
| Drive chain excessively tight |6.2.1d| | 1 |
| Front Brake lever attachment screws missing |3.1.2b| | 1 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 1 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 1 |
| Front wheel spindle securing nut|s| loose |2.3.3a| | 1 |
| Fuel system component insecure |7.2.1b| | 1 |
| Drive chain worn to excess |6.2.1e| | 1 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Front suspension has inadequate damping effect. |2.3.6c| | 1 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 1 |
| Fuel system component leaking |6.1.3 |b| |i|| | 1 |
| Stop lamp not working |4.3.1 |a| |ii|| | 1 |
| Rear Roller brake test indicates brake effort fall disproportional to brake lever or pedal effort |3.3.A1c| | 1 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 1 |
| Nearside Front Direction indicator not working |4.4.1 |a| |ii|| | 1 |
| Nearside Handlebar grip insecure to handlebar |2.2.1 |d| |ii|| | 1 |
| Rear wheel insecure |4.2.3b| | 1 |