| Most common failures | No# failures |
|---|
| Registration plate issues | 148 |
| Headlamp aim out of alignment | 139 |
| Rear reflector on motorcycle missing |1.4.1| | 128 |
| Rear reflector missing (4.8.2 (a) (ii)) | 67 |
| Registration plate lamp issues | 55 |
| Drive chain excessively loose |6.2.1d| | 30 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 27 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 24 |
| 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 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 22 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 20 |
| Drive chain worn to excess |6.2.1e| | 19 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 16 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition (8.1.1 (a)) | 16 |
| Rear reflector missing |4.8.2 |a| |ii|| | 16 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 16 |
| Front Brake excessively binding (1.2.1 (f)) | 15 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 14 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 14 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 14 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 13 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 11 |
| Drive chain excessively tight |6.2.1d| | 11 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 11 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 10 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 10 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 10 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 9 |
| Front Valve stem seriously damaged (5.2.3 (j)) | 8 |
| Front wheel bearings have excessive free play |2.3.5b| | 8 |
| Exhaust noise is clearly in excess of that emitted by a similar motorcycle fitted with a standard silencer in average condition |8.1.1 |a|| | 7 |
| Stop lamp remains on when the brakes are released | 7 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 7 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 7 |
| Headlamp insecure (4.1.1 (c)) | 7 |
| Front Wheel bearing so rough it is likely to overheat or break up (5.1.3 (b) (ii)) | 7 |
| Horn not working |1.7.3a| | 7 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 6 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 6 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Steering headbearing has excessive free play |2.2.2| | 6 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 6 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 6 |
| Offside Handlebar deformed |2.1.1b| | 6 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 6 |
| Drive chain excessively loose |6.1.7 |c| |i|| | 6 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 6 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 6 |
| Rear Stop lamp not working (4.3.1 (a) (ii)) | 5 |
| Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Headlamp insecure |1.2.3b| | 5 |
| All direction indicators not working (4.4.1 (a) (ii)) | 5 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 5 |
| Rear Drive chain excessively loose |6.2.1d| | 5 |
| Rear Direction indicator obviously incorrectly positioned (4.4.3 (a)) | 5 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Rear Drive chain sprocket worn to excess (6.1.7 (c) (i)) | 4 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 4 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 4 |
| Nearside Front Direction indicators not working |1.5.1c| | 4 |
| Rear Brake excessively binding (1.2.1 (f)) | 4 |
| Nearside Handlebar grip insecure to handlebar (2.2.1 (d) (ii)) | 4 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 4 |
| Rear Footrest missing |6.2.1a| | 4 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 4 |
| Rear Rear reflector missing |4.8.2 |a| |ii|| | 4 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 4 |
| Headlamp aim so that beam "kick up" is not visible on the screen |4.1.2 |a|| | 4 |