| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 133 |
| Drive chain excessively loose |6.2.1d| | 72 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 56 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 49 |
| Horn not working |1.7.3a| | 48 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 41 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 39 |
| Registration plate issues | 39 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 37 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 35 |
| Riders seat insecure |6.2.1a| | 33 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 31 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 30 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 28 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 25 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 24 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 23 |
| Drive chain worn to excess |6.2.1e| | 22 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 20 |
| Front Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 19 |
| Front wheel bearings have excessive free play |2.3.5b| | 19 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 19 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 19 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 18 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 18 |
| Rear Wheel spoke excessively loose |4.2.1b| | 18 |
| Steering headbearing has excessive free play |2.2.2| | 18 |
| Stop lamp remains on when the brake is released |1.3.1e| | 17 |
| Front suspension assembly excessive wear or free play in a front suspension component |2.3.4| | 16 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 15 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 15 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 15 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 14 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 14 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 13 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 13 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 13 |
| Direction indicator affected by the operation of another lamp |1.5.1c| | 12 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 12 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 12 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 12 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 12 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 12 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 11 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 11 |
| Handlebar mounting clamp loose |2.1.1a| | 11 |
| Rear Brake locking device missing |3.2.A1e| | 11 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 10 |
| Front Wheel spoke excessively loose |4.2.1b| | 10 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 10 |
| Direction indicators not working |1.5.1c| | 9 |
| Front suspension assembly component excessively bent |2.3.1| | 9 |
| Offside Rear Direction indicator insecure |1.5.3b| | 9 |
| Handlebar deformed |2.1.1b| | 9 |
| Rear Drive chain excessively loose |6.2.1d| | 9 |
| Headlamp switch faulty |1.2.4| | 9 |
| Front suspension assembly component excessively misaligned |2.3.1| | 9 |
| Rear Wheel has an excessively distorted bead rim. |4.2.2| | 9 |
| Rear reflector on motorcycle missing |1.4.1| | 8 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 8 |
| Brake lever has inadequate reserve travel |3.1.3b| | 8 |
| Stop lamp remains on when the brakes are released | 8 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 8 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 8 |
| Front Brake lever cannot be released smoothly |3.1.3d| | 8 |
| Brake pedal cannot be released smoothly |3.1.3d| | 7 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 7 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 7 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 7 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 6 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 6 |
| Front Stop lamp missing |1.3.3a| | 6 |
| Front Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Front Front suspension assembly component excessively bent |2.3.1| | 6 |
| Rear Motorcycle structure excessively corroded |6.1.1a| | 6 |
| Drive chain excessively tight |6.2.1d| | 6 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 6 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 6 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 6 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 6 |
| Front Direction indicators not working |1.5.1c| | 6 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 6 |
| Front suspension assembly has excessive free play in the pivot bearings. |2.3.2| | 6 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 5 |
| Floor brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.C1b| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 5 |
| All position lamps adversely affected by the operation of another lamp |1.1.3b| | 5 |
| Rear Wheel spoke missing |4.2.1b| | 5 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 5 |
| Nearside Front Direction indicators not working |1.5.1c| | 5 |
| Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Nearside Rear Direction indicator damaged and function impaired |1.5.3a| | 5 |
| Headlamp aim headlamp damaged and function impaired |1.2.3a| | 5 |
| Nearside Direction indicator not working |1.5.1c| | 5 |
| Nearside Footrest insecure |6.2.1a| | 5 |
| Front Brake cable excessively corroded |3.2.A1b| | 4 |
| Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Steering linkage has excessive free play |2.2.2| | 4 |
| Rear Stop lamp missing |1.3.3a| | 4 |
| Offside Front Direction indicator not working |1.5.1c| | 4 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 4 |
| Nearside Front Footrest insecure |6.2.1a| | 4 |
| Rear Drive chain worn to excess |6.2.1e| | 4 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 4 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Nearside Direction indicators not working |1.5.1c| | 4 |
| Nearside Rear Direction indicators not working |1.5.1c| | 4 |
| Rear Wheel has an excessively eccentric bead rim. |4.2.2| | 4 |
| Rear wheel spindle loose |2.4.A.2b| | 4 |
| Front Brake lever is bent and the brake cannot be readily applied |3.1.3c| | 4 |
| Nearside Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Offside Front Direction indicator damaged and function impaired |1.5.3a| | 4 |
| Front Horn not working |1.7.3a| | 4 |
| Rear Brake pedal pivots excessively worn |3.1.3a| | 4 |
| Motorcycle structure excessively corroded |6.1.1a| | 4 |
| Roller brake test Neither brake control achieves an efficiency of 25% |3.3.A2b| | 4 |
| Offside Front Direction indicator insecure |1.5.3b| | 4 |
| Front wheel bearings are excessively rough |2.3.5b| | 4 |
| Brake pedal cannot be applied smoothly |3.1.3d| | 4 |
| Throttle operating incorrectly |6.2.1f| | 4 |
| Dipswitch does not deflect the main beam/s, making them into dipped beam/s |1.2.2b|ii|| | 4 |
| Offside Rear shock absorber insecurely mounted |2.4.A.3b| | 4 |
| Brake locking device missing |3.2.A1e| | 4 |
| Offside Footrest insecure |6.2.1a| | 4 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 4 |
| Front Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 4 |