| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 164 |
| Registration plate issues | 76 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 34 |
| Offside Rear Direction indicator not working |1.5.1c| | 32 |
| Offside Rear Direction indicators not working |1.5.1c| | 32 |
| Nearside Rear Direction indicator not working |1.5.1c| | 27 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 21 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 18 |
| Nearside Rear Direction indicators not working |1.5.1c| | 18 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 16 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 15 |
| Riders seat insecure |6.2.1a| | 15 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 15 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 15 |
| Rear wheel spindle securing nut|s| loose |2.4.A.2b| | 14 |
| Rear wheel insecure |4.2.3b| | 14 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 13 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 12 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 11 |
| Rear reflector on motorcycle missing |1.4.1| | 10 |
| Stop lamp remains on when the brake is released |1.3.1e| | 10 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 10 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 9 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 9 |
| Horn not working |1.7.3a| | 9 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 8 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 8 |
| Headlamp insecure |1.2.3b| | 7 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 7 |
| Rear Rear wheel has a loose wheel nut|s| |4.2.3a| | 6 |
| Front Position lamp not working (4.2.1 (a)) | 6 |
| Rear Position lamp not working (4.2.1 (a)) | 6 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 6 |
| Rear wheel has a loose wheel nut|s| |4.2.3a| | 6 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 6 |
| Indicator tell tale not functioning |1.5.2| | 6 |
| Horn sound not in accordance with requirements (7.7 (c)) | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Steering headbearing has excessive free play |2.2.2| | 5 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Rear Wheel fixing loose (single fixing) (5.2.1 (a) (ii)) | 5 |
| Throttle operating incorrectly |6.2.1f| | 5 |
| Exhaust excessively deteriorated |7.1.1a| | 5 |
| Nearside Front Direction indicators not working |1.5.1c| | 5 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 5 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Registration plate lamp issues | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Rear Wheel bearing has excessive play (5.1.3 (a) (i)) | 4 |
| 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| | 4 |
| Stop lamp remains on when the brakes are released | 4 |
| Direction indicators not working |1.5.1c| | 4 |
| Brake pedal cannot be released smoothly |3.1.3d| | 4 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 4 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 3 |
| Rear Direction indicators not working |1.5.1c| | 3 |
| All direction indicators not working (4.4.1 (a) (ii)) | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 3 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 3 |
| Horn not working (7.7 (a)) | 3 |
| Exhaust has a major leak of exhaust gases |6.1.2 |a|| | 3 |
| Rear Direction indicator not working |1.5.1c| | 3 |
| Rear Position lamp adversely affected by the operation of another lamp (4.2.3 (b)) | 3 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 3 |
| Position lamp not working (4.2.1 (a)) | 3 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Front Brake fluid reservoir fluid level dangerously low |3.2.B1d| | 3 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |