| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 256 |
| Registration plate issues | 69 |
| Rear reflector on motorcycle missing |1.4.1| | 69 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 42 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 41 |
| Horn not working |1.7.3a| | 38 |
| Drive chain excessively loose |6.2.1d| | 33 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 26 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 23 |
| Front wheel bearings have excessive free play |2.3.5b| | 23 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 21 |
| Drive chain worn to excess |6.2.1e| | 19 |
| Headlamp aim beam image kick up to the offside |1.6| | 18 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 16 |
| Registration plate lamp issues | 16 |
| Direction indicators not working |1.5.1c| | 15 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 14 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 14 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 12 |
| Rear reflector missing (4.8.2 (a) (ii)) | 12 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 11 |
| Offside Front Direction indicator not working |1.5.1c| | 11 |
| Brake lever has inadequate reserve travel |3.1.3b| | 11 |
| 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| | 11 |
| Exhaust markings indicating not for road use or similar wording |7.1.4| | 10 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 10 |
| Front wheel bearings are excessively rough |2.3.5b| | 10 |
| Drive chain excessively tight |6.2.1d| | 9 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 9 |
| Nearside Front Direction indicator not working |1.5.1c| | 9 |
| Steering headbearing has excessive free play |2.2.2| | 9 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 9 |
| Offside Front Direction indicators not working |1.5.1c| | 7 |
| Offside Front Shock absorber has a serious fluid leak (5.3.2 (b)) | 7 |
| Riders seat insecure |6.2.1a| | 7 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 7 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Horn not working (7.7 (a) (ii)) | 7 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Front Stop lamp not working (4.3.1 (a) (ii)) | 6 |
| Front position lamp incorrect colour |1.1.2a| | 6 |
| Front Brake lever has insufficient reserve travel (1.1.2 (a)) | 6 |
| Front Front wheel bearings have excessive free play |2.3.5b| | 6 |
| Horn not working |7.7 |a| |ii|| | 6 |
| Drive chain worn to excess (6.1.7 (c) (i)) | 5 |
| Rear Brake excessively binding (1.2.1 (f)) | 5 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 5 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 5 |
| Rear reflector missing |4.8.2 |a| |ii|| | 5 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Stop lamp remains on when the brake is released |1.3.1e| | 5 |
| Front Front wheel bearings are excessively rough |2.3.5b| | 5 |
| Stop lamp remains on when the brakes are released | 5 |
| Horn not working (7.7 (a)) | 5 |
| Front Stop lamp not working |4.3.1 |a| |ii|| | 5 |
| Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Front Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 4 |
| Nearside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Offside Front Direction indicator not working (4.4.1 (a) (ii)) | 4 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 4 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Rear Position lamp not working (4.2.1 (a)) | 4 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear Valve stem seriously damaged (5.2.3 (j)) | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 4 |
| Front Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 4 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 4 |
| Offside Rear Direction indicator not working |1.5.1c| | 4 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 4 |