| Most common failures | No# failures |
|---|
| Headlamp aim out of alignment | 102 |
| Registration plate issues | 62 |
| Rear reflector on motorcycle missing |1.4.1| | 45 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 28 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 27 |
| Horn not working |1.7.3a| | 25 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 23 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 21 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 20 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 19 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 17 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 16 |
| Steering headbearing has excessive free play |2.2.2| | 16 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 15 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 14 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 13 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 12 |
| Drive chain excessively loose |6.2.1d| | 11 |
| Rear Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 11 |
| Riders seat insecure |6.2.1a| | 11 |
| Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 10 |
| Throttle has a significant change in engine speed whilst moving the steering from lock to lock |2.1.4| | 10 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 10 |
| Offside Rear Direction indicator not working |1.5.1c| | 10 |
| Front wheel spindle securing nut locking device missing |2.3.3a| | 9 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 9 |
| Headlamp aim beam image kick up to the offside |1.6| | 9 |
| Throttle operating incorrectly |6.2.1f| | 9 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 8 |
| 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| | 8 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Front Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 7 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 7 |
| Stop lamp affected by the operation of another lamp |1.3.2| | 7 |
| Nearside Rear Direction indicator not working |1.5.1c| | 7 |
| Locking device|s| not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 7 |
| Direction indicators affected by the operation of another lamp |1.5.1c| | 7 |
| Front Brake lever has inadequate reserve travel |3.1.3b| | 7 |
| Rear Roller brake test indicates a binding brake |3.3.A1a| | 6 |
| Front Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 6 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 6 |
| Direction indicators not working |1.5.1c| | 6 |
| Front Steering headbearing has excessive free play |2.2.2| | 6 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 6 |
| Direction indicators flashing less than 60 times a minute |1.5.1c| | 5 |
| Offside Front Direction indicator not working |1.5.1c| | 5 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 5 |
| Rear Brake pedal has inadequate reserve travel |3.1.3b| | 5 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 5 |
| Rear Brake locking device missing |3.2.A1e| | 5 |
| Nearside Rear Direction indicators not working |1.5.1c| | 5 |
| Rear Wheel alignment incorrect which adversely affects the handling |2.5.1| | 5 |
| Front Roller brake test indicates a sticking brake |3.3.A1a| | 5 |
| Front Hydraulic brake control feels spongy |3.1.4a| | 4 |
| Horn control defective |1.7.2a| | 4 |
| Front Roller brake test indicates excessive fluctuation of brake effort |3.3.A1d| | 4 |
| Rear Rear wheel spindle securing nut locking device missing |2.4.A.2b| | 4 |
| Front wheel spindle securing nut locking device missing |2.3.5a| | 4 |
| Nearside Front Direction indicator not working |1.5.1c| | 4 |
| Front position lamp incorrect colour |1.1.2a| | 4 |
| Brake pedal has inadequate reserve travel |3.1.3b| | 4 |
| Headlamp not working on dipped beam |4.1.1 |a| |ii|| | 4 |
| Nearside Front Shock absorber has a serious fluid leak |2.7.3| | 4 |
| Nearside Rear Direction indicator insecure |1.5.3b| | 4 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Headlamp not working on dipped beam (4.1.1 (a) (ii)) | 4 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 3 |
| Rear Roller brake test indicates a severely grabbing brake |3.3.A1b| | 3 |
| Offside Rear Direction indicators not working |1.5.1c| | 3 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 3 |
| Fuel cap does not fasten securely maintaining the sealing arrangement |7.2.2b| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Headlamp insecure |1.2.3b| | 3 |
| Rear reflector on motorcycle incorrectly positioned |1.4.2d| | 3 |
| Brake locking device insecure |3.2.A1e| | 3 |
| All position lamps not working |4.2.1 |a|| | 3 |
| Fuel cap sealing washer deteriorated |7.2.2c| | 3 |
| Nearside Front Direction indicators not working |1.5.1c| | 3 |
| Offside Front Direction indicators not working |1.5.1c| | 3 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 3 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 3 |
| Rear Brake locking device insecure |3.2.A1e| | 3 |
| Offside Rear Rear reflector missing |1.5.1a| | 3 |
| Rear Roller brake test indicates a severely juddering brake |3.3.A1b| | 3 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 3 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 3 |
| Front Floor brake test indicates a binding brake |3.3.C2c| | 3 |
| Headlamp not working on main beam |4.1.1 |a| |ii|| | 3 |
| Drive chain worn to excess |6.2.1e| | 3 |
| Rear Roller brake test indicates brake effort rise disproportional to brake lever or pedal effort |3.3.A1c| | 3 |
| Stop lamp remains on when the brakes are released | 3 |
| Front wheel bearings are excessively rough |2.3.5b| | 3 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 3 |
| Registration plate lamp issues | 3 |
| Rear Brake lever has inadequate reserve travel |3.1.3b| | 3 |
| Front Brake master cylinder leaking hydraulic fluid |3.2.B1e| | 3 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 3 |
| Nearside Front Footrest insecure |6.2.1a| | 3 |
| Fuel pipe leaking |7.2.1a| | 3 |
| Headlamp aim headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Front Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 3 |
| Headlamp switch faulty |1.2.4| | 3 |
| Front Front wheel spindle securing nut locking device missing |2.3.3a| | 3 |
| Front Headlamp aim beam image kick up to the offside |1.6| | 3 |
| Horn not working |1.6.2a| | 3 |
| Stop lamp not working |4.3.1 |a| |ii|| | 3 |
| Horn not working (7.7 (a) (ii)) | 3 |