| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 187 |
| Rear reflector on motorcycle missing |1.4.1| | 117 |
| Registration plate issues | 94 |
| Horn not working |1.7.3a| | 39 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 38 |
| Registration plate lamp issues | 37 |
| Drive chain excessively loose |6.2.1d| | 34 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 32 |
| Rear reflector missing (4.8.2 (a) (ii)) | 31 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 26 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| 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| | 18 |
| Horn not working (7.7 (a)) | 15 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 15 |
| Drive chain excessively tight |6.2.1d| | 14 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 14 |
| Drive chain worn to excess |6.2.1e| | 13 |
| Horn not working |7.7 |a| |ii|| | 12 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 11 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 11 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 10 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 10 |
| Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Offside Front Footrest insecure |6.2.1a| | 10 |
| Front Brake excessively binding (1.2.1 (f)) | 10 |
| Stop lamp remains on when the brakes are released | 10 |
| Steering headbearing has excessive free play |2.2.2| | 9 |
| Steering movement excessively stiff with the wheel raised |2.2.1b| | 8 |
| Offside Front Direction indicator not working |1.5.1c| | 8 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 8 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 8 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 8 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 8 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Rear reflector missing |4.8.2 |a| |ii|| | 8 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 8 |
| Rear suspension bearing has excessive free play |2.4.A2a|i|| | 7 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 7 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 7 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 6 |
| Nearside Front Direction indicator not working |1.5.1c| | 6 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 6 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 6 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 6 |
| Horn not working (7.7 (a) (ii)) | 6 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 5 |
| Offside Footrest insecure |6.2.1a| | 5 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 5 |
| Front Valve stem seriously damaged |5.2.3 |j|| | 5 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Front Brake fluid reservoir insecurely mounted |3.2.B1a| | 5 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 5 |
| Rear Brake pedal cannot be applied smoothly |3.1.3d| | 4 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Offside Rear Footrest missing |6.2.1a| | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Nearside Rear Footrest missing |6.2.1a| | 4 |
| Rear Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Riders seat insecure |6.2.1a| | 4 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 4 |
| Exhaust has part of the system missing |7.1.1a| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Brake pedal cannot be released smoothly |3.1.3d| | 4 |
| Riders seat insecure (6.2.5 (a) (ii)) | 4 |