| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 16 |
| Drive chain excessively loose |6.2.1d| | 11 |
| Rear reflector on motorcycle missing |1.4.1| | 8 |
| Headlamp aim beam image kick up to the offside |1.6| | 7 |
| Drive chain worn to excess |6.2.1e| | 7 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 6 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Horn not working |1.7.3a| | 5 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 5 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 4 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 4 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Steering headbearing has excessive free play |2.2.2| | 4 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 4 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 3 |
| Rear reflector on motorcycle obscured |1.4.1| | 3 |
| Front wheel bearings have excessive free play |2.3.5b| | 3 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Drive chain excessively tight |6.2.1d| | 3 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 3 |
| Rear Drive chain excessively loose |6.2.1d| | 2 |
| Nearside Rear Footrest insecure |6.2.1a| | 2 |
| Registration plate issues | 2 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 2 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 2 |
| Riders seat insecure |6.2.1a| | 2 |
| Nearside Rear Direction indicators not working |1.5.1c| | 2 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 2 |
| Offside Front Direction indicators not working |1.5.1c| | 2 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 2 |
| Nearside Front Direction indicators not working |1.5.1c| | 2 |
| Indicator switch insecure |1.5.4| | 2 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 2 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 2 |
| Horn is not continous or uniform |1.7.3c| | 2 |
| Front Brake lever cannot be applied smoothly |3.1.3d| | 2 |
| All position lamps do not illuminate immediately when switched on |1.1.3a| | 2 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 2 |
| Throttle operating incorrectly |6.2.1f| | 2 |
| Front Horn not working |1.7.3a| | 1 |
| Rear Drive chain excessively tight |6.2.1d| | 1 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Rear Brake locking device missing |3.2.A1e| | 1 |
| Roller brake test No brake control achieves an efficiency of 30%. |3.3.A2a| | 1 |
| Nearside Rear Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 1 |
| Rear Stop lamp remains on when the brake is released |1.3.1e| | 1 |
| Rear Brake pedal cannot be released smoothly |3.1.3d| | 1 |
| Chain guard insecure |6.2.1c| | 1 |
| Rear Brake pedal has insufficient reserve travel (1.1.2 (a)) | 1 |
| Drive chain excessively loose (6.1.7 (c) (i)) | 1 |
| Drive chain sprocket so loose it is likely to fail (6.1.7 (c) (ii)) | 1 |
| Front Brake grabbing severely (1.2.1 (c)) | 1 |
| Footrest insecure (6.2.12 (a)) | 1 |
| All direction indicators not working (4.4.1 (a) (ii)) | 1 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 1 |
| Headlamp not working on main beam (4.1.1 (a) (ii)) | 1 |
| All position lamps not working (4.2.1 (a)) | 1 |
| Stop lamp not working (4.3.1 (a) (ii)) | 1 |
| Horn not working (7.7 (a) (ii)) | 1 |
| Position lamp switch insecure (4.2.2 (b)) | 1 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 1 |
| Rear Direction indicators flashing more than 120 times per minute |1.5.1c| | 1 |
| Front position lamp adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Front Upper Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Nearside Rear Lower Drive chain excessively loose |6.2.1d| | 1 |
| Front Upper Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 1 |
| Front Upper Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 1 |
| All position lamps adversely affected by the operation of another lamp |1.1.3b| | 1 |
| Nearside Rear Lower Drive chain worn to excess |6.2.1e| | 1 |
| Nearside Rear Lower Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Nearside Rear Lower Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Offside Front Lower Steering control handlebar movement restricted by cables caught on a projection |2.1.2c| | 1 |
| Front Upper Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Front Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 1 |
| Front Direction indicators not working |1.5.1c| | 1 |
| Rear Direction indicators not working |1.5.1c| | 1 |
| Rear Rear position lamp deteriorated and function impaired |1.1.1b| | 1 |
| Front Headlamp insecure |1.2.3b| | 1 |
| Rear Rear reflector on motorcycle obscured |1.4.1| | 1 |
| Drive chain sprocket carrier worn to excess |6.2.1e| | 1 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 1 |
| Clutch lever shortened so it cannot be readily operated. |6.2.1g| | 1 |
| Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 1 |
| Offside Front Direction indicator insecure |1.5.3b| | 1 |
| Fuel system component leaking |7.2.1a| | 1 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 1 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 1 |
| Rear Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Handlebar deformed |2.1.1b| | 1 |
| Nearside Rear Direction indicator not working |1.5.1c| | 1 |
| Front Footrest insecure |6.2.1a| | 1 |
| Front Brake lever insecure |3.1.2a| | 1 |
| Nearside Front Clutch lever bent so it cannot be readily operated (6.2.7 (b)) | 1 |
| Offside Front Stop lamp adversely affected by the operation of another lamp (4.3.3 (b)) | 1 |
| Central Front Footrest insecure (6.2.12 (a)) | 1 |
| Nearside Rear Drive chain excessively loose drive chain so worn out and loose (6.1.7 (c) (i)) | 1 |
| Offside Front Brake lever not releasing correctly and functionality of brakes affected (1.1.2 (b) (ii)) | 1 |
| Rear Wheel spoke cracked. |4.2.1b| | 1 |
| Front Roller brake test indicates a severely grabbing brake |3.3.A1b| | 1 |
| Offside Rear Direction indicators not working |1.5.1c| | 1 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 1 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 1 |
| Front wheel bearings are excessively rough |2.3.5b| | 1 |
| Rear Brake pedal insecure |3.1.2a| | 1 |
| Rear Brake component defective due to a deliberate modification which significantly reduces the original strength |3.1.5| | 1 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 1 |
| Front Direction indicators flashing less than 60 times a minute |1.5.1c| | 1 |
| Front suspension assembly component excessively corroded. |2.3.1| | 1 |
| Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Front position lamp adversely affected by the operation of the horn |1.1.3b| | 1 |
| Rear position lamp adversely affected by the operation of the horn |1.1.3b| | 1 |
| Headlamp aim not tested |1.6| | 1 |
| Front position lamp missing |1.1.1a| | 1 |
| Fuel cap mounting flange/sealing method defective |7.2.2c| | 1 |
| Direction indicator flashing more than 120 times per minute |1.5.1c| | 1 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 1 |
| Front Front mudguard insecure |2.3.7| | 1 |
| Front position lamp insecure |1.1.1c| | 1 |
| Nearside Drive chain excessively loose |6.2.1d| | 1 |
| Clutch lever bent so it cannot be readily operated. |6.2.1g| | 1 |
| Front Brake disc|s| has excessive run out |3.2.A1m| | 1 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 1 |
| Front Brake back plate|s| insecure |3.2.A1j| | 1 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 1 |
| Nearside Front Front suspension assembly component excessively corroded. |2.3.1| | 1 |
| Offside Front Front suspension assembly component excessively corroded. |2.3.1| | 1 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 1 |
| Indicator tell tale not functioning |1.5.2| | 1 |
| Brake pedal is positioned so that the brake cannot be readily applied |3.1.3c| | 1 |
| Front Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Rear Direction indicator flashing less than 60 times a minute |1.5.1c| | 1 |
| Front Steering headbearing has excessive free play |2.2.2| | 1 |
| Front Headlamp deteriorated and function impaired |1.2.3a| | 1 |
| Rear Roller brake test indicates a sticking brake |3.3.A1a| | 1 |
| Drive chain sprocket worn to excess |6.2.1e| | 1 |
| Direction indicators not working |1.5.1c| | 1 |
| Brake pedal pivots excessively worn |3.1.3a| | 1 |
| Front An item not tested |Manual| | 1 |
| Centre Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 1 |
| Rear Floor brake test indicates a sticking brake |3.3.C2c| | 1 |
| Nearside Front Upper Position lamp switch insecure |1.1.4b| | 1 |
| Offside Front Upper Position lamp switch insecure |1.1.4b| | 1 |
| Stop lamp affected by the operation of the horn |1.3.2| | 1 |
| Front mudguard insecure |2.3.7| | 1 |