| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 55 |
| Horn not working |1.7.3a| | 29 |
| Registration plate issues | 24 |
| 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| | 20 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 19 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 14 |
| Drive chain excessively loose |6.2.1d| | 13 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 10 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 9 |
| Offside Rear Direction indicator not working |1.5.1c| | 8 |
| Rear reflector on motorcycle missing |1.4.1| | 7 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 7 |
| Throttle operating incorrectly |6.2.1f| | 7 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 6 |
| Nearside Rear Direction indicator not working |1.5.1c| | 5 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 4 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 4 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 4 |
| Drive chain worn to excess |6.2.1e| | 4 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 4 |
| Nearside Front Footrest insecure |6.2.1a| | 4 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Rear Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 3 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 3 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Fuel system component insecure |7.2.1b| | 3 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 2 |
| Fuel system component leaking |7.2.1a| | 2 |
| Fuel hose leaking |7.2.1a| | 2 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 2 |
| Offside Front Footrest insecure |6.2.1a| | 2 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 2 |
| Headlamp aim beam image kick up to the offside |1.6| | 2 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 2 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Front Footrest insecure |6.2.1a| | 2 |
| Riders seat insecure |6.2.5 |a| |ii|| | 2 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 2 |
| Stop lamp remains on when the brake is released |1.3.1e| | 2 |
| Direction indicators not working |1.5.1c| | 2 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 2 |
| Rear wheel insecure |4.2.3b| | 2 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 2 |
| Drive chain excessively tight |6.2.1d| | 2 |
| Nearside Footrest insecure |6.2.1a| | 2 |
| Offside Footrest insecure |6.2.1a| | 2 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 2 |
| Nearside Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Steering headbearing has excessive free play |2.2.2| | 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 |
| Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 2 |
| Dipswitch does not operate immediately when selected on dipped beam (4.1.3 (b)) | 2 |
| Front Brake excessively binding (1.2.1 (f)) | 2 |
| Rear Stop lamp does not illuminate by the operation of both brake controls (4.3.2 (a) (iii)) | 2 |
| Headlamp aim projected beam image obviously incorrect (4.1.2 (c)) | 2 |