| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 347 |
| Rear reflector on motorcycle missing |1.4.1| | 200 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 164 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 121 |
| Drive chain excessively loose |6.2.1d| | 106 |
| Registration plate issues | 96 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 94 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 88 |
| Drive chain worn to excess |6.2.1e| | 76 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 70 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 65 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 64 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 58 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 52 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 52 |
| Steering headbearing has excessive free play |2.2.2| | 51 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 50 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 49 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 49 |
| Horn not working |1.7.3a| | 47 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 46 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 42 |
| Throttle operating incorrectly |6.2.1f| | 39 |
| Drive chain excessively tight |6.2.1d| | 35 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 34 |
| Registration plate lamp issues | 31 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 30 |
| Handlebar deformed |2.1.1b| | 29 |
| Headlamp insecure |1.2.3b| | 29 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 28 |
| Rear reflector on motorcycle obscured |1.4.1| | 27 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 27 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 27 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 25 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 24 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 24 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 23 |
| Nearside Rear Direction indicator not working |1.5.1c| | 23 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 22 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 22 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 21 |
| Exhaust excessively deteriorated |7.1.1a| | 20 |
| Headlamp aim not tested |1.6| | 20 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 20 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 20 |
| Rear Footrest missing |6.2.1a| | 19 |
| Offside Rear Direction indicator not working |1.5.1c| | 19 |
| Nearside Rear Footrest missing |6.2.1a| | 18 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 18 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 18 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 18 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 18 |
| Riders seat insecure |6.2.1a| | 18 |
| Stop lamp remains on when the brake is released |1.3.1e| | 17 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 17 |
| Offside Rear Footrest missing |6.2.1a| | 17 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 17 |
| Headlamp aim beam image kick up to the offside |1.6| | 16 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 15 |
| Nearside Front Direction indicator not working |1.5.1c| | 15 |
| Rear reflector missing (4.8.2 (a) (ii)) | 14 |
| Offside Front Direction indicator not working |1.5.1c| | 13 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 13 |
| Front Drive chain sprocket worn to excess |6.2.1e| | 13 |
| Rear Wheel spoke missing |4.2.1b| | 13 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 13 |
| Offside Rear Footrest insecure |6.2.1a| | 12 |
| Front Wheel spoke excessively loose |4.2.1b| | 12 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 12 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 12 |
| Front Wheel has an excessively distorted bead rim. |4.2.2| | 12 |
| Front Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 12 |
| Front Brake disc|s| excessively worn |3.2.A1l| | 11 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 11 |
| Rear Drive chain worn to excess |6.2.1e| | 11 |
| Rear Drive chain excessively loose |6.2.1d| | 11 |
| Nearside Rear Direction indicator missing |1.5.1a| | 11 |
| Front wheel bearings have excessive free play |2.3.5b| | 11 |
| Nearside Rear Direction indicators not working |1.5.1c| | 11 |
| Stop lamp remains on when the brakes are released | 11 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 10 |
| Direction indicators not working |1.5.1c| | 10 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 10 |
| Offside Rear Direction indicators not working |1.5.1c| | 10 |
| 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| | 10 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 10 |
| Offside Rear Direction indicator insecure |1.5.3b| | 10 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 10 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 10 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 9 |
| Rear reflector missing |4.8.2 |a| |ii|| | 9 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 9 |
| Rear Wheel spoke cracked. |4.2.1b| | 8 |
| Front Floor brake test indicates a sticking brake |3.3.C2c| | 8 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 8 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Rear Wheel spoke excessively bent |4.2.1b| | 7 |
| Lower Rear suspension bush has excessive free play |2.4.A2a|i|| | 7 |
| Rear Brake lining|s| less than 1.5 mm thick |3.2.A1f|i|| | 7 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 7 |
| Nearside Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 6 |
| Rear suspension component excessively corroded. |2.4.A.1a| | 6 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 6 |
| Nearside Rear Direction indicator incorrect colour |1.5.1b| | 6 |
| Clutch lever positioned so it cannot be readily operated. |6.2.1g| | 6 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 6 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 6 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 6 |
| Rear Exhaust excessively deteriorated |7.1.1a| | 6 |
| Front Brake component has restricted free movement and operation is likely to be impeded |3.2.A1h| | 6 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 6 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |