| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 91 |
| Registration plate issues | 79 |
| Rear reflector on motorcycle missing |1.4.1| | 30 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 20 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 11 |
| Rear reflector missing (4.8.2 (a) (ii)) | 10 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 9 |
| 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| | 9 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 7 |
| Stop lamp remains on when the brakes are released | 7 |
| Rear reflector missing |4.8.2 |a| |ii|| | 7 |
| Horn not working |1.7.3a| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 6 |
| Horn not working (7.7 (a)) | 6 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 5 |
| Headlamp aim beam image kick up to the offside |1.6| | 5 |
| Offside Rear 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| | 5 |
| Rear Rear reflector missing (4.8.2 (a) (ii)) | 5 |
| Rear Direction indicator not working |1.5.1c| | 4 |
| Stop lamp remains on when the brake is released |1.3.1e| | 4 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 4 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 4 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Front wheel bearings have excessive free play |2.3.5b| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 3 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Registration plate lamp issues | 3 |
| Steering headbearing has excessive free play |2.2.2| | 3 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Nearside Front Direction indicator not working |1.5.1c| | 3 |
| Direction indicator not working |1.5.1c| | 3 |
| Offside Rear Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 3 |
| Rear Position lamp not working (4.2.1 (a)) | 3 |
| Handlebar so insecure it is likely to become detached (2.2.1 (b) (ii)) | 3 |
| Front Position lamp not working (4.2.1 (a)) | 3 |
| 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)) | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 2 |
| Front Direction indicator not working |1.5.1c| | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Handlebar mounting clamp bolt loose |2.1.1a| | 2 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 2 |
| Rear Position lamp not working |4.2.1 |a|| | 2 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 2 |
| Horn missing |1.7.1| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Offside Rear Footrest missing |6.2.1a| | 2 |
| Offside Front Direction indicator not working |1.5.1c| | 2 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Offside Front 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 |
| Offside Rear Direction indicators not working |1.5.1c| | 2 |
| Front Steering headbearing has excessive wear or free play (2.2.2 (f) (i)) | 2 |
| All direction indicators missing (4.4.1 (a) (ii)) | 2 |
| Headlamp incorrect colour (4.1.4 (a)) | 2 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 2 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Rear Wheel spindle locking device missing (5.2.1 (d)) | 2 |
| Riders seat insecure (6.2.5 (a) (ii)) | 2 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |
| Nearside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 2 |