| Most common failures | No# failures |
|---|
| Registration plate issues | 342 |
| Headlamp aim out of alignment | 250 |
| Rear reflector on motorcycle missing |1.4.1| | 197 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 126 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 91 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 83 |
| 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| | 81 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 69 |
| Drive chain excessively loose |6.2.1d| | 68 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 68 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 52 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 48 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 46 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 43 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 39 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 32 |
| Steering headbearing has excessive free play |2.2.2| | 30 |
| Headlamp aim beam image kick up to the offside |1.6| | 29 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 29 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 25 |
| Offside Rear Direction indicator not working |1.5.1c| | 25 |
| Drive chain worn to excess |6.2.1e| | 24 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 23 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 23 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 21 |
| Drive chain excessively tight |6.2.1d| | 21 |
| Rear Rear wheel bearings have excessive free play |2.4.A.2c| | 21 |
| Rear reflector missing (4.8.2 (a) (ii)) | 21 |
| Horn not working |1.7.3a| | 18 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 18 |
| Rear Brake disc|s| cracked |3.2.A1g| | 18 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 17 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 16 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 16 |
| Registration plate lamp issues | 16 |
| Offside Front Direction indicator not working |1.5.1c| | 15 |
| Nearside Rear Direction indicators not working |1.5.1c| | 15 |
| Nearside Front Direction indicator not working |1.5.1c| | 14 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 14 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 14 |
| Throttle operating incorrectly |6.2.1f| | 14 |
| Front position lamp incorrect colour |1.1.2a| | 13 |
| Direction indicators not working |1.5.1c| | 13 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 12 |
| 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| | 12 |
| Nearside Rear Direction indicator not working |1.5.1c| | 12 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 11 |
| Rear Brake disc|s| excessively worn |3.2.A1l| | 11 |
| Front wheel bearings have excessive free play |2.3.5b| | 11 |
| Nearside Front Direction indicators not working |1.5.1c| | 10 |
| Offside Rear Direction indicators not working |1.5.1c| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 10 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 10 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 9 |
| Rear Brake disc fractured (1.1.14 (a) (ii)) | 9 |
| Front Brake indicates excessive fluctuation of brake effort (1.2.1 (e)) | 9 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 8 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 8 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 8 |
| Rear reflector missing |4.8.2 |a| |ii|| | 8 |
| Steering control fouling between components which interferes with the free movement of the steering |2.1.2a| | 7 |
| Rear Exhaust is leaking and excessively noisey |7.1.1b| | 7 |
| Headlamp switch faulty |1.2.4| | 7 |
| Nearside Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Steering headbearing excessively stiff or notchy (2.2.2 (f) (i)) | 7 |
| Rear Position lamp not working (4.2.1 (a)) | 7 |
| Nearside Rear Direction indicator not working (4.4.1 (a) (ii)) | 7 |