| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 490 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 152 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 128 |
| Drive chain excessively loose |6.2.1d| | 124 |
| Horn not working |1.7.3a| | 115 |
| Rear reflector on motorcycle missing |1.4.1| | 105 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 102 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 93 |
| Registration plate issues | 89 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 76 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 74 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 68 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 67 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 66 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 64 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 59 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 58 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 56 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 56 |
| Drive chain worn to excess |6.2.1e| | 54 |
| Rear reflector on motorcycle obscured |1.4.1| | 53 |
| Steering headbearing has excessive free play |2.2.2| | 51 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 48 |
| Direction indicators not working |1.5.1c| | 47 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 43 |
| Headlamp aim beam image kick up to the offside |1.6| | 42 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 42 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 39 |
| Front wheel bearings have excessive free play |2.3.5b| | 39 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 39 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 39 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 37 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 35 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 35 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 35 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 35 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 35 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 35 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 32 |
| Handlebar deformed |2.1.1b| | 30 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 30 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 29 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 28 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 27 |
| Front suspension has inadequate damping effect. |2.3.6c| | 25 |
| Drive chain excessively tight |6.2.1d| | 24 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 24 |
| Throttle operating incorrectly |6.2.1f| | 23 |
| Headlamp insecure |1.2.3b| | 22 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 22 |
| Rear reflector missing (4.8.2 (a) (ii)) | 22 |
| Nearside Rear Direction indicator not working |1.5.1c| | 21 |
| Rear Wheel spoke excessively loose |4.2.1b| | 20 |
| Stop lamp remains on when the brake is released |1.3.1e| | 20 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 20 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 20 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Front Direction indicator not working |1.5.1c| | 19 |
| Chain guard insecure |6.2.1c| | 19 |
| Rear Drive chain excessively loose |6.2.1d| | 19 |
| Headlamp aim not tested |1.6| | 19 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 19 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 18 |
| Nearside Front Direction indicator not working |1.5.1c| | 17 |
| Rear Direction indicator not working |1.5.1c| | 17 |
| Brake lever has inadequate reserve travel |3.1.3b| | 17 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 17 |
| Direction indicator not working |1.5.1c| | 17 |
| Brake locking device missing |3.2.A1e| | 16 |
| Offside Front Direction indicator not working |1.5.1c| | 16 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 16 |
| Rear Brake locking device missing |3.2.A1e| | 16 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 16 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 16 |
| Headlamp switch faulty |1.2.4| | 15 |
| Front wheel bearings are excessively rough |2.3.5b| | 15 |
| Front suspension has excessive stiffness in the suspension movement. |2.3.6b| | 15 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 15 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 15 |
| Riders seat insecure |6.2.1a| | 14 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 14 |
| Rear suspension movement is excessively stiff |2.4.A.3b| | 14 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 13 |
| Front Front mudguard insecure |2.3.7| | 13 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 13 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 12 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 12 |
| Rear Brake pedal pivots excessively worn |3.1.3a| | 12 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 12 |
| Rear Position lamp not working (4.2.1 (a)) | 12 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 12 |
| Front Direction indicators not working |1.5.1c| | 12 |
| Rear Rear suspension bush has excessive free play |2.4.A2a|i|| | 12 |
| Horn is not continous or uniform |1.7.3c| | 12 |
| Front Steering headbearing has excessive free play |2.2.2| | 12 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 12 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 12 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 12 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 12 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 12 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 11 |
| Horn not working |7.7 |a| |ii|| | 11 |
| Stop lamp remains on when the brakes are released | 11 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 11 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 11 |
| Rear position lamp insecure |1.1.1c| | 11 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 11 |
| Offside Rear Direction indicator not working |1.5.1c| | 10 |
| Horn not working (7.7 (a) (ii)) | 10 |
| Front Footrest insecure |6.2.1a| | 10 |
| Rear reflector missing |4.8.2 |a| |ii|| | 10 |
| Rear suspension component loose |2.4.A.1a| | 10 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 10 |
| Front Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 10 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 10 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 10 |
| Nearside Rear Direction indicators not working |1.5.1c| | 10 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 9 |
| Rear Brake reaction bracket securing bolt|s| loose |3.2.A1j| | 9 |
| Rear Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 9 |
| Front Position lamp not working (4.2.1 (a)) | 9 |
| Horn missing |1.7.1| | 9 |
| Front Wheel spoke excessively loose |4.2.1b| | 9 |
| Exhaust excessively deteriorated |7.1.1a| | 9 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Motorcycle structure insecure and likely to affect the correct functioning of the steering or braking |6.1.1c| | 8 |
| Front mudguard insecure |2.3.7| | 8 |
| Offside Front Direction indicators not working |1.5.1c| | 8 |
| Rear Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 8 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 8 |
| Front suspension assembly component excessively misaligned |2.3.1| | 8 |
| Rear Brake pedal cannot be applied smoothly |3.1.3d| | 8 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 8 |
| All direction indicators not working |4.4.1 |a| |ii|| | 8 |
| All direction indicators not working (4.4.1 (a) (ii)) | 8 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 8 |
| Front Direction indicator affected by the operation of another lamp |1.5.1c| | 8 |
| Rear Direction indicator affected by the operation of another lamp |1.5.1c| | 8 |
| Registration plate lamp issues | 8 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Rear Wheel spoke missing |4.2.1b| | 8 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 8 |
| Front Horn not working |1.7.3a| | 8 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 8 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 8 |