| Most common failures | No# failures |
|---|
| Rear reflector on motorcycle missing |1.4.1| | 126 |
| Headlamp aim out of alignment | 100 |
| Steering headbearing has excessive free play |2.2.2| | 76 |
| Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 71 |
| Rear Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 65 |
| Registration plate issues | 58 |
| Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 53 |
| Nearside Front shock absorber seal failed and leaking oil |2.3.3| | 48 |
| Front Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 38 |
| Exhaust is leaking and excessively noisey |7.1.1b| | 34 |
| Horn not working |1.7.3a| | 30 |
| Riders seat insecure |6.2.1a| | 26 |
| Rear reflector on motorcycle obscured |1.4.1| | 26 |
| Offside Front shock absorber seal failed and leaking oil |2.3.3| | 26 |
| Headlamp at least one does not illuminate on dipped beam |1.2.2a|i|| | 22 |
| Rear wheel bearings have excessive free play |2.4.A.2c| | 21 |
| Front shock absorber seal failed and leaking oil |2.3.3| | 18 |
| Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 18 |
| Front Brake disc|s| friction surface contaminated by oil or grease |3.2.A1k| | 18 |
| Fuel cap sealing washer missing |7.2.2c| | 17 |
| Steering movement excessively `notchy` with the weight on the lower bearing |2.2.1a| | 16 |
| Steering movement excessively `notchy` with the wheel raised |2.2.1b| | 16 |
| Headlamp at least one does not illuminate on main beam |1.2.2a|ii|| | 15 |
| Direction indicators not working |1.5.1c| | 14 |
| Front wheel bearings have excessive free play |2.3.5b| | 13 |
| Exhaust mounting does not fully support the exhaust system |7.1.1.c| | 13 |
| Nearside Handlebar handgrip not secure to handlebars. |2.1.1c| | 13 |
| Throttle operating incorrectly |6.2.1f| | 13 |
| Headlamp insecure |1.2.3b| | 12 |
| Roller brake test The less effective brake control does not achieve an efficiency of 25%. |3.3.A2b| | 12 |
| 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 |
| Front wheel bearings are excessively rough |2.3.5b| | 11 |
| Fairings insecure and likely to impede the steering |2.1.2e| | 10 |
| Nearside Front Front shock absorber seal failed and leaking oil |2.3.3| | 10 |
| Rear position lamp deteriorated and function impaired |1.1.1b| | 10 |
| Horn not loud enough to be heard by another road user |1.7.3a| | 10 |
| Nearside Rear Direction indicator not working |1.5.1c| | 9 |
| Rear Rear position lamp does not illuminate immediately when it is switched on |1.1.3a| | 8 |
| Rear Rear reflector on motorcycle missing |1.4.1| | 8 |
| Rear Direction indicator not working |1.5.1c| | 7 |
| Offside Front Front shock absorber seal failed and leaking oil |2.3.3| | 7 |
| Wheel alignment incorrect which adversely affects the handling |2.5.1| | 7 |
| Nearside Front Direction indicator not working |1.5.1c| | 7 |
| Front Direction indicator not working |1.5.1c| | 7 |
| Indicator tell tale not functioning |1.5.2| | 7 |
| Rear Brake disc|s| excessively scored |3.2.A1l| | 7 |
| Front Exhaust is leaking and excessively noisey |7.1.1b| | 6 |
| Offside Rear Direction indicator not working |1.5.1c| | 6 |
| Rear shock absorber seal failed and leaking oil |2.4.A.1c| | 6 |
| Nearside Front Direction indicators not working |1.5.1c| | 6 |
| Front Front shock absorber seal failed and leaking oil |2.3.3| | 5 |
| Wheel alignment incorrect which adversely affects the steering |2.5.1| | 5 |
| Offside Front Direction indicators not working |1.5.1c| | 5 |
| Direction indicators flashing more than 120 times per minute |1.5.1c| | 5 |
| Rear wheel rotation likely to be impeded |6.2.1b| | 5 |
| Offside Handlebar handgrip not secure to handlebars. |2.1.1c| | 5 |
| Front Roller brake test indicates a binding brake |3.3.A1a| | 5 |
| Headlamp aim not tested |1.6| | 5 |
| Headlamp dipped beam affected by the operation of another lamp |1.2.2c| | 5 |
| Offside Rear Direction indicators not working |1.5.1c| | 5 |
| Front Fairings insecure and likely to impede the steering |2.1.2e| | 4 |
| Rear Front mudguard insecure |2.3.7| | 4 |
| Front Steering headbearing has excessive free play |2.2.2| | 4 |
| Rear position lamp adversely affected by the operation of another lamp |1.1.3b| | 4 |
| Rear Rear position lamp deteriorated and function impaired |1.1.1b| | 4 |
| Steering movement excessively stiff with the weight on the lower bearing |2.2.1a| | 4 |
| Indicator switch defective |1.5.4| | 4 |
| Locking devices not correctly fitted which may make the motor bicycle dangerous to ride |6.2.1h| | 4 |
| Rear Rear shock absorber has inadequate damping effect. |2.4.A.3b| | 4 |
| Stop lamp not working (4.3.1 (a) (ii)) | 3 |
| Nearside Rear Direction indicators not working |1.5.1c| | 3 |
| Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Nearside Stop lamp does not illuminate immediately a brake applies |1.3.1a| | 3 |
| Offside Front Direction indicator not working |1.5.1c| | 3 |
| Motorcycle structure excessively damaged |6.1.1a| | 3 |
| Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Front Front position lamp does not illuminate immediately when switched on |1.1.3a| | 3 |
| Handlebar mounting clamp loose |2.1.1a| | 3 |
| Headlamp deteriorated and function impaired |1.2.3a| | 3 |
| Rear reflector missing (4.8.2 (a) (ii)) | 3 |
| Rear position lamp insecure |1.1.1c| | 3 |
| Rear position lamp incorrect colour |1.1.2b| | 3 |
| Front Direction indicator flashing more than 120 times per minute |1.5.1c| | 3 |
| Rear Brake hose is likely to be fouled or trapped by moving parts |3.2.B2c| | 3 |
| Front Stop lamp remains on when the brake is released |1.3.1e| | 3 |
| Headlamp main beam affected by the operation of another lamp |1.2.2c| | 3 |
| Front Front suspension has inadequate damping effect. |2.3.6c| | 3 |
| Rear Brake lever is so short and the brake cannot be readily applied |3.1.3c| | 3 |
| Rear suspension bush has excessive free play |2.4.A2a|i|| | 3 |