| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 68 |
| Rear reflector on motorcycle missing |1.4.1| | 61 |
| Horn not working |1.7.3a| | 38 |
| Registration plate issues | 33 |
| Registration plate lamp issues | 14 |
| Horn not working (7.7 (a)) | 13 |
| Rear reflector missing (4.8.2 (a) (ii)) | 13 |
| Drive chain excessively loose |6.2.1d| | 12 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 9 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 9 |
| Horn not working |7.7 |a| |ii|| | 7 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 7 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 7 |
| Offside Front Footrest insecure |6.2.1a| | 6 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 6 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 5 |
| Offside Rear Direction indicators not working |1.5.1c| | 4 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 4 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 4 |
| Offside Footrest insecure |6.2.1a| | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 3 |
| Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Steering headbearing has excessive free play |2.2.2| | 3 |
| Nearside Front Brake disc contaminated (1.1.14 (b)) | 3 |
| Offside Front Brake disc contaminated (1.1.14 (b)) | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Rear reflector missing |4.8.2 |a| |ii|| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 2 |
| Central Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 2 |
| Stop lamp remains on when the brakes are released | 2 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 2 |
| Nearside Front Shock absorber has a serious fluid leak |5.3.2 |b|| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Drive chain excessively tight (6.1.7 (k) (i)) | 2 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25% (1.2.2 (a) (i)) | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 2 |
| Horn control not functioning. |1.7.2b| | 2 |
| 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| | 2 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Rear Brake reaction bracket insecure |3.2.A1j| | 2 |
| Nearside Rear Direction indicator not working |1.5.1c| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Rear Brake excessively binding (1.2.1 (f)) | 2 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 2 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 2 |
| Front Horn not working |1.7.3a| | 2 |
| Nearside Rear Footrest insecure |6.2.1a| | 2 |
| Drive chain horseshoe locking device incorrectly fitted (6.1.7 (j) (i)) | 2 |
| Rear Wheel bearing rough when rotated (5.1.3 (b) (i)) | 2 |
| Front Stop lamp does not emit a steady light |1.3.1b| | 2 |
| Rear Stop lamp affected by the operation of another lamp |1.3.2| | 2 |
| Horn sound not in accordance with requirements (7.7 (c)) | 2 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 2 |
| Nearside Footrest insecure |6.2.12 |a|| | 2 |
| Headlamp insecure |4.1.1 |c|| | 2 |
| Front Position lamp not working |4.2.1 |a|| | 2 |