| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 368 |
| Rear reflector on motorcycle missing |1.4.1| | 230 |
| Registration plate issues | 191 |
| Registration plate lamp issues | 87 |
| Drive chain excessively loose |6.2.1d| | 78 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 65 |
| Horn not working |1.7.3a| | 61 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 54 |
| Rear reflector missing (4.8.2 (a) (ii)) | 50 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 47 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 46 |
| Offside Front Footrest insecure |6.2.1a| | 37 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 35 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 34 |
| Front Brake excessively binding (1.2.1 (f)) | 31 |
| Horn not working (7.7 (a)) | 30 |
| Drive chain worn to excess |6.2.1e| | 27 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 27 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 25 |
| 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| | 24 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 22 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 20 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 19 |
| Rear reflector missing |4.8.2 |a| |ii|| | 18 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 18 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 18 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 18 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 17 |
| Throttle operating incorrectly |6.2.1f| | 16 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 15 |
| Drive chain excessively tight |6.2.1d| | 15 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 14 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 14 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 14 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 14 |
| Offside Rear Direction indicators not working |1.5.1c| | 14 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 13 |
| Horn not working (7.7 (a) (ii)) | 13 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 13 |
| Nearside Front Footrest insecure |6.2.1a| | 13 |
| Stop lamp remains on when the brake is released |1.3.1e| | 13 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 12 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 12 |
| Stop lamp remains on when the brakes are released | 11 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 11 |
| Nearside Rear Direction indicator not working |1.5.1c| | 11 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Rear Stop lamp does not emit a steady light |1.3.1b| | 11 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 10 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 10 |
| Exhaust has part of the system missing |7.1.1a| | 10 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 10 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 10 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 10 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 10 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Nearside Front Direction indicator not working |1.5.1c| | 9 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 9 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 9 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 9 |
| Front position lamp incorrect colour |1.1.2a| | 9 |
| Brake lever cannot be applied smoothly |3.1.3d| | 8 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 8 |
| Riders seat insecure |6.2.1a| | 8 |
| Rear Drive chain excessively loose |6.2.1d| | 8 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 8 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 8 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 8 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 8 |
| Nearside Front Direction indicators not working |1.5.1c| | 8 |
| Offside Front Direction indicators not working |1.5.1c| | 8 |
| Rear Hydraulic brake control feels spongy |3.1.4a| | 8 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 7 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 7 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 7 |
| Nearside Rear Direction indicators not working |1.5.1c| | 7 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 7 |
| Rear Brake pedal cannot be applied smoothly |3.1.3d| | 7 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 7 |
| Throttle operating incorrectly (6.2.7 (a) (i)) | 7 |
| Steering headbearing has excessive free play |2.2.2| | 7 |
| Front Position lamp not working (4.2.1 (a)) | 7 |
| Rear Brake excessively binding (1.2.1 (f)) | 7 |